# Design Patent Priority: The Six-Month Clock Under Paris 4(C)

Priya Menon · August 23, 2026

> Design Patent Priority: The Six-Month Clock Under Paris 4(C). Open the Paris Convention to Article 4(C) and the asymmetry is printed ...

| Takeaway | Detail |
| --- | --- |
| The treaty itself gives designs half the patent clock. | Paris Convention Article 4(C) allows twelve months of priority for patents but only six for industrial designs, so a team that plans around a full year has booked six months of phantom runway — a discovery that surfaces only after the $100 filing fee is a sunk cost. |
| The twelve-month window US teams trust is a domestic artifact. | Domestic statute extends the full twelve months to US design applications, confirmed in the MPEP, while the Hague System and every treaty-following office stop at six; the mismatch stays invisible until a foreign filing fails, at a correction cost that dwarfs a $100 fee. |
| Grace periods are shields, not extensions. | The twelve-month grace periods in the EU, Japan, and Korea excuse only the applicant's own disclosure and never defeat an intervening competitor filing, so a rival's earlier application prevails even mid-grace — a loss priced in market position, not in a recoverable $100 fee. |
| Menon's fix is procedural: make month six the docketed deadline. | Enter the foreign six-month date in the docketing system the day the home application is filed and treat it as controlling in every non-US jurisdiction — a calendar entry that costs less than a $100 fee and closes the only gap the grace periods leave open. |

Open the Paris Convention to Article 4(C) and the asymmetry is printed in the treaty itself: twelve months of priority for patents, six for industrial designs. One convention, two clocks. A designer who has internalized the inventor's year is working to a schedule the treaty never offered, and the gap is not a drafting quirk — it is the operative rule in every jurisdiction that follows the convention.

The United States is the exception that builds the trap. Under the domestic statute, a US design application takes the full twelve months, as the MPEP confirms, so American teams plan confidently around a year that exists almost nowhere else. The Hague System runs on the six-month clock, and so does every foreign office a global launch touches.

The reassurances are thinner than they look. The twelve-month grace periods in the EU, Japan, and Korea excuse a designer's own disclosure; they never defeat an intervening competitor filing, so a rival who reaches the office first takes the field outright. That is why Priya Menon's prescription is a docket-control rule rather than new legislation: calendar month six as the true deadline, because no statute will file the foreign application for you.

![Grand neoclassical courthouse Paris dawn pale limestone columns](https://static.mm-ais.com/article-images-ai/design-patent-priority-the-six-month-clo-ai-6d5a30fb.jpg)
Grand neoclassical courthouse Paris dawn pale limestone columns

## Two Clocks

Paris Convention Article 4(C) draws the line that breaks most design dockets: six months of priority for industrial designs, twelve for patents and utility models. That six-month term governs priority claims at EUIPO, UKIPO, CNIPA, JPO, and KIPO alike — none of those offices offers a treaty-based day beyond it. A docketing template cloned from a utility PCT family therefore miscalculates every non-US design deadline by exactly half a year, and the error surfaces only when a foreign examiner rejects the priority claim as untimely.

The United States is the statutory outlier. Under the domestic statute, a US design application may claim foreign priority within the full twelve months, and the MPEP confirms that design applications receive the same year patents do. The asymmetry runs one way: the USPTO in Alexandria accepts what the treaty merely lets other offices shorten, while every other major office takes the shorter option. An Alicante or Tokyo filer gets six months; the same applicant filing the same design in Alexandria gets twelve.

Then there is the second clock, unrelated to priority: own-disclosure grace periods. The EU's design regulation, Japan's Design Act, and Korea's Design Protection Act each allow twelve months — but they forgive only the applicant's own disclosure and expressly leave earlier third-party rights intact. Grace is an amnesty, not a time machine. It cannot antedate your filing past a competitor's intervening application, which is precisely why treating it as a substitute for priority forfeits rights.

Hague filings compress the six-month rule into a single instrument. One international application filed with WIPO's International Bureau carries the priority claim measured from the first (home) filing date; designations are fixed at filing, and individual designation fees fall due upfront rather than at a later national stage. Miss the six-month mark before the home filing and the international application simply proceeds without priority — no cure, no restoration.

Docket the two clocks off different triggers. Priority runs from the first application's filing date; grace runs from the disclosure date. A product revealed at a January 2026 trade show before any filing starts the grace clock that day — but creates no priority date, because there is no earlier application to claim from. If a competitor files in February and you file in April, every office abroad treats the February application as senior, and the grace period forgives only your own booth display.

One housekeeping item for 2026: an EU regulation renames the Registered Community Design the European Union Design (EUD) and restructures fees from its own applicability date — verify the current instrument and date in the Official Journal. Update docket templates, matter names, and invoice codes now — a stale "RCD" label on a 2026 matter invites misrouted renewals and mismatched fee schedules across the portfolio.

| Clock | Governing text | Trigger event | Window | What it forgives |
| --- | --- | --- | --- | --- |
| Priority — EUIPO, UKIPO, CNIPA, JPO, KIPO | Paris Convention Art. 4(C) | First application's filing date | 6 months | Intervening third-party filings |
| Priority — USPTO | US domestic statute; MPEP | First application's filing date | Twelve months | Intervening third-party filings |
| Grace — EU | EU design regulation | Applicant's own disclosure date | Twelve months | Your own disclosure only |
| Grace — Japan | Design Act | Applicant's own disclosure date | Twelve months | Your own disclosure only |
| Grace — Korea | Design Protection Act | Applicant's own disclosure date | Twelve months | Your own disclosure only |

Calendar accordingly: every non-US design filing lands at exactly six months from the first filing date, minus a ten-business-day buffer, and twelve-month dates are reserved exclusively for USPTO actions. When a stakeholder asks why the design deadline differs from the utility family, the answer is one sentence — Article 4(C) sets six months for designs, and only Congress gave the USPTO twelve.

![Vast iron and glass railway hall dusk golden light slanting](https://static.mm-ais.com/article-images-ai/design-patent-priority-the-six-month-clo-ai-2e030103.jpg)
Vast iron and glass railway hall dusk golden light slanting

## The Paper Trail

According to WIPO's Hague Yearly Review — pull the latest edition, since counts drift year to year — it tallies the international design applications and the designs they cover that clear Geneva annually, and the repeat names atop the filer tables are Samsung, LG, and Huawei. Treat that list as a docketing signal: these are companies shipping hardware into dozens of markets within weeks of launch, and they run their foreign design programs through a single international filing whose priority term is the six-month one laid out in the matrix above. Nobody in the top tier operates a utility-style year for designs, because outside the USPTO no such year exists.

The scale beneath that artery is starker. Per WIPO's IP Statistics Data Center and CNIPA's own reporting, China's design patent filings run at a scale no other office approaches, making CNIPA the world's largest design office by volume. Counts vary by edition, so extract the current figures before quoting them to a client — but the scale holds, and it defines the stakes: when a priority claim lapses, the largest single pool of design rights on earth is the first thing forfeited.

The USPTO's own numbers explain why the failure stays hidden. Patents by the Numbers and the PTMT workload data show the annual tally of design patents granted in FY2023, with average pendency near 20 months. Set that against the month-six lapse point above: foreign rights seeded by a US first filing die more than a year before the USPTO tells the applicant the US case succeeded. No office action, no examiner query, no rejection letter flags the lapsed claim — the error surfaces only when someone finally checks the foreign register, often at enforcement time.

EUIPO's Annual Report sizes the commercial exposure: registered design applications arrive in volume year after year, in the largest single design territory by foreign filings. In the EU the register is the enforcement currency — customs actions, marketplace takedowns, and infringement suits all key off a recorded right. A blown deadline there is not a lost filing fee; it is an unregistered field handed to competitors in the territory where foreign filers concentrate most heavily.

The route itself is now universal. WIPO's Contracting Parties list records the United States and China as members of the Hague System, with Saudi Arabia and the UAE among the recent additions — so the single-filing path reaches every major jurisdiction a 2026 design docket will name. Nothing in the public record reviewed for this guide shows any 2026 amendment altering these windows; verify against WIPO's current contracting-parties page before locking dates.

If a stakeholder still insists the design family gets "the same treatment as the utility PCT," hand over this paper trail: the filers who dominate these statistics file into the shorter system, and the EU/Japan/Korea grace periods forgive only your own disclosure — a competitor's intervening application still defeats you. Concrete step: create one "paper trail" tab in the docket holding the five current-edition documents below, each annotated with its retrieval date so the next auditor knows exactly which figures the calendar relied on.

| Primary source | What it records | Docketing use |
| --- | --- | --- |
| WIPO Hague Yearly Review (latest edition) | Annual tally of international applications and the designs they cover; Samsung, LG, Huawei lead | Confirms the Hague route as the main artery; benchmark your template against top filers |
| WIPO IP Statistics Data Center + CNIPA reporting | Chinese design filings lead global volume by a wide margin | Sizes the largest forfeitable pool; refresh the extract before client-facing quotes |
| USPTO Patents by the Numbers / PTMT | Annual design grants in FY2023; average pendency near 20 months | Defines the year-plus silence in which a lapsed claim goes undetected |
| EUIPO Annual Report | Heavy annual volume of registered design applications | Quantifies the EU exposure behind one missed deadline |
| WIPO Contracting Parties list | United States and China both members; Saudi Arabia and UAE recent additions | Verifies single-filing coverage for every major 2026 target |

![The Paper Trail — Design Patent Priority](https://static.mm-ais.com/article-images-pixabay/design-patent-priority-the-six-month-clo-45ae1017.jpg)

## Deadline Matrix: Month Six Wins Every Column

Run the dominance test before anything touches the docket software: a single foreign filing date either preserves priority in all seven venues or it doesn't. The month-six date does. The twelve-month date cloned from a utility PCT template wins one row — the USPTO's — and forfeits the other six. That asymmetry, not any fee differential, is why the safe internal date repeats identically down the last column.

| Venue | Statutory priority window | Own-disclosure grace | Grace beats intervening third-party filing? | Safe internal filing date |
| --- | --- | --- | --- | --- |
| USPTO | Twelve months (domestic statute) | Twelve months (own-disclosure exception) | Yes | First filing + twelve months, less 10-business-day buffer |
| EUIPO | 6 months (Paris Art. 4(C)) | Twelve months (EU design regulation) | No | First filing + 6 months, less 10-business-day buffer |
| UKIPO | 6 months | Twelve months (own-disclosure only) | No | First filing + 6 months, less 10-business-day buffer |
| CNIPA | 6 months | None in general practice (narrow statutory exceptions) | No | First filing + 6 months, less 10-business-day buffer |
| JPO | 6 months | Twelve months (design-law grace) | No | First filing + 6 months, less 10-business-day buffer |
| KIPO | 6 months | Twelve months (design-law grace) | No | First filing + 6 months, less 10-business-day buffer |
| Hague route | 6 months | None at WIPO level; each designated office applies its own | No | First filing + 6 months, less 10-business-day buffer |

**Mandatory table note:** the EU, Japanese, and Korean twelve-month graces exist only to forgive the applicant's own disclosure. Scored against an intervening third-party filing, each returns "no" — a rival who files after your trade-show reveal and before your foreign application takes the right. They belong in the matrix as context; they must never be selected as a filing-timing strategy.

Read the final column as the decision. A month-six filing weakly dominates: it preserves priority in every row, including the USPTO's, whose longer ceiling tolerates the earlier act. The twelve-month date loses on every non-US row because the six-month line drawn above binds industrial designs in each of those offices. No scenario exists in which waiting past month six improves a right; exactly one exists — a US-only strategy — where waiting is merely harmless.

Beneath the matrix sits a route choice. The Hague international application wins when the first filing sits in a Hague member and three or more designations are wanted: one WIPO filing, one renewal cycle, one recorded ownership change. Direct Paris national filings win for one or two targets, or wherever local prosecution control pays — CNIPA examines design applications substantively, so a Chinese filing rewards an agent who argues novelty and amends drawings directly rather than relaying through Geneva. Between two designations and three, price both paths with your agents; the crossover shifts by firm and by year, so verify against current fee schedules rather than trusting last cycle's quote.

For multi-design families, consolidation is the default. One Hague application holding every variant shares a single priority date and a consolidated publication, keeping the family's priority chain auditable on one line. Split only when variants face different commercialization timelines — a product shipping next quarter versus a concept still in tooling — because later division adds per-design fees and restarts administrative steps. One hard limit: WIPO accepts multiple designs in a single international application only within the same Locarno class, so a family spanning classes divides regardless of strategy.

Set the gate at month four. That is the go/no-go checkpoint for confirming target countries, budget sign-off, and translation scope — CNIPA, JPO, and KIPO filings require translated drawings and text, and agent appointments consume lead time of their own. Anything deferred past month five collides with those lead times ahead of the month-six wall, and a blown priority claim is unrecoverable: no petition, no fee, no fix. Calendar the gate as a hard meeting with the product team, not a passive reminder.

Concrete next step: for each design first filed this year, enter two dates now — the month-four gate and the month-six deadline less a ten-business-day buffer — and reserve the twelve-month entry exclusively for the USPTO follow-on. Then delete any inherited PCT-style twelve-month foreign-filing task from the design record; leaving it in place is how the forfeiture happens quietly.

![Deadline Matrix: Month Six Wins Every Column — Design Patent Priority](https://static.mm-ais.com/article-images-pixabay/design-patent-priority-the-six-month-clo-5fd9a61e.jpg)

## What the Data Doesn't Tell You

Every figure in this guide describes filings that went right, and that survivorship is the first caveat to carry forward. No office in the Hague system publishes how many priority claims arrived on time, lapsed, or were quietly abandoned — a blown date leaves no statistical fingerprint, surfacing only as a later filing without a priority claim, indistinguishable from deliberate strategy. Published decisions are nearly as quiet: design-priority disputes reach case reports far less often than utility-priority fights, so the confidence behind the matrix rests on statutory text and office practice, not a deep litigation record. Read it as the law as written, then verify each cell against the office's current practice guidelines — procedural details and fee schedules drift year to year.

Variance hides in three places the matrix compresses into single columns. Grace periods look interchangeable on a one-line chart and are not: the USPTO's own-disclosure exception and the novelty graces in Europe, Japan, and Korea each forgive only the applicant's own disclosure, and none of them touches a competitor's intervening application. The belief worth killing outright — "our design filings ride the same foreign window as our utility PCT family" — fails twice: outside the USPTO a design claim inherits the shorter Paris term, and the overseas graces forgive your own disclosure only. Restoration is the second variable: several Asian offices entertain petitions to revive a priority right lost unintentionally, each with its own evidentiary bar and short petition window, while EUIPO offers no comparable routine path, so a lapsed claim there behaves as final. Counting is the third: offices differ on whether a deadline landing on a local holiday rolls to the next working day, and on whose midnight governs — details that decide marginal cases.

The month-six default breaks, or bends, in four situations worth pre-clearing with counsel. A first filing that is withdrawn, abandoned, or held not to disclose the design collapses the priority base retroactively — the remedy is documentation and re-anchoring, not a longer clock. Exhibition priority under Paris Convention Article 11 runs on its own terms from the exhibit's opening and cannot be swapped for ordinary priority afterward. Restoration jurisdictions can revive a missed date by petition, which argues for the ten-business-day buffer, not against it — petitions cost fees and guarantee nothing. And on the USPTO side, the USPTO's own-disclosure grace period is a defense, not a shield: a competitor's own earlier US design application still wins the race. None of these rescues a docket that copied the utility template; they explain why the buffer exists. Before signing off on any docket built on the matrix above, run one verification pass — confirm each office's current counting rule and restoration posture in its official guidelines, log the source and date in the docket record, and where a guideline is silent, assume the short date and file early.

| Edge case | How the default behaves | The move |
| --- | --- | --- |
| Priority lapses at JPO, KIPO, or CNIPA | Petition-based restoration may apply; standards and windows are set by each office's rules | File the restoration petition immediately; never assume revival |
| Priority lapses at EUIPO | No routine restoration path; treat the claim as final | Bank the buffer; refile without priority if needed |
| Deadline lands on a weekend or local holiday | Most offices roll to the next working day; conventions vary | Confirm the counting rule in the office's current guidelines |
| Competitor files an intervening design during your grace period | Grace forgives only your own disclosure; the race is lost | File first; never treat grace as strategy |
| First application withdrawn or defective | Priority base collapses retroactively | Document the chain; re-anchor dates to the surviving filing |
| Design debuts at an exhibition | Paris Article 11 protection runs its own clock from the opening | Calendar it separately from ordinary priority |

![What the Data Doesn't Tell You — Design Patent Priority](https://static.mm-ais.com/article-images-pixabay/design-patent-priority-the-six-month-clo-46ce8f49.jpg)

## What the Filing Data Can't Show

WIPO's statistics count every design application its member offices accept; they cannot count the ones never filed. No office publishes how many applicants miss the month-six priority term, because a forfeiture rarely announces itself — it surfaces as an abandoned application, a private settlement with whoever captured the lapsed design, or a silent non-filing that enters no register at all. Past the survivorship caveat already noted in this guide sits a harder attribution problem: an abandonment in the register looks identical whether counsel missed the date or marketing killed the product line. The true error rate is therefore unknowable from official statistics, and anyone quoting one is guessing.

The false-parity trap lives in comparative charts. A side-by-side table listing "grace period: twelve months" for the EU, Japan, and Korea beside the USPTO's twelve-month windows implies equivalence, but the identical numeral masks opposite legal effects: a novelty grace forgives your own prior disclosure, confers no priority right, and leaves a competitor's intervening application free to defeat you. The belief that a design filing inherits the utility-PCT family's foreign window dies here — outside the USPTO the design term runs to month six, and those grace rows measure disclosure forgiveness, not third-party protection. Before circulating any chart, sort its rows into "forgives my disclosure" versus "blocks later filers."

Practice variance compounds this, and no statute captures it. Because the US accepts twelve months under its domestic statute, foreign associates sometimes carry the utility-patent habit into US-origin design chains and quote patent-style timing back to counsel. Two firms can return different deadlines for the identical fact pattern, and no database records the divergence — it surfaces only when someone reconciles the answers. The fix is contractual: put the treaty term, not the US statute, in the engagement letter, and require written confirmation of the computed date for each venue.

Restoration adds a second layer of uncertainty. Several systems permit restoring a priority right after unintentional lapse, and CNIPA's amended Implementing Regulations — effective January 2024 — broadened restored-period options. But availability, evidence standards, and fees vary by office, so one jurisdiction's reassuring answer predicts nothing about the next. Headline windows never reveal whether a missed date is recoverable; treat restoration as a contingency to price before filing day, not a safety net assumed at drafting.

Exposure is skewed, too. According to WIPO's own statistics, most design filings worldwide are resident-only, so aggregate volumes say nothing about how often smaller companies attempt a foreign filing and fail. That population — the one most exposed to the month-six trap — barely registers in the data, because its failures take the form of silent non-filings or early abandonments. Benchmark a filing program against internally logged intended-filing counts, not against global volume trends.

Mechanical date math fails at month boundaries. A first filing on the final day of a long month can land the six-month mark on a calendar date that does not exist — a thirty-first day in a month that ends earlier. Offices resolve the collision differently: the short month's last day, the first day of the following month, or the day after that, depending on local convention and time zone. A three-day spread on a single fact pattern can decide a priority fight, so compute both boundary candidates, docket the earliest, and confirm the receiving office's convention in writing.

| What the record shows | Why it hides a miss | Docket response |
| --- | --- | --- |
| Abandoned application | A missed month-six date and a strategic pull look identical in the register | Treat post-month-six abandonments as suspected forfeitures until confirmed |
| Private settlement | A competitor capturing a lapsed design never reaches a public register | Log threatened rights alongside the docket entry |
| "Grace period: twelve months" row (EU, Japan, Korea) | Forgives your own disclosure; blocks no intervening filer | Separate grace rows from priority rows before sharing charts |
| Associate deadline advice | Utility-patent timing habits travel silently between firms | Require written confirmation of the treaty-computed date per venue |
| Restoration availability | Evidence standards and fees vary by office | Price restoration contingencies before relying on recovery |
| First filing on a long month's final day | The nonexistent follow-on date resolves as the short month's last day, or the first or second day of the next month, by local convention | Docket the earliest candidate; confirm the office's rule in writing |

Run the 2026 docket against the left column above; any cell you cannot verify belongs on this week's call with each foreign associate — the published```

## Frequently Asked Questions

**How long is the priority window for an industrial design under the Paris Convention compared with a patent?**

Paris Convention Article 4(C) allows twelve months of priority for patents but only six for industrial designs.

**Why do US teams often assume they have a full year to file design applications abroad?**

Under the domestic statute, confirmed in the MPEP, a US design application receives the same twelve-month priority window patents do, while the Hague System and every treaty-following office stop at six.

**What happens if I miss the six-month priority mark when filing through the Hague System?**

The international application simply proceeds without priority — there is no cure and no restoration.

**Does the twelve-month grace period in the EU, Japan, or Korea protect me if a competitor filed first?**

No — those grace periods excuse only the applicant's own disclosure and expressly leave earlier third-party rights intact, so a rival's earlier application prevails even mid-grace.

**If I reveal my product at a trade show before filing anything, do I get a priority date?**

A product revealed at a January 2026 trade show starts the grace clock that day but creates no priority date, because there is no earlier application to claim from.

**How far ahead of the six-month treaty deadline should I calendar non-US design filings?**

Every non-US design filing should land at exactly six months from the first filing date minus a ten-business-day buffer, with twelve-month dates reserved exclusively for USPTO actions.

## Quick answers

| How long a priority period does Paris Convention Article 4(C) give industrial designs compared to patents? | Article 4(C) allows twelve months of priority for patents but only six months for industrial designs. |
| --- | --- |
| How long does a US design application have to claim foreign priority? | Under the domestic statute, as confirmed by the MPEP, a US design application may claim foreign priority within the full twelve months. |
| What do the twelve-month grace periods in the EU, Japan, and Korea actually forgive? | They excuse only the applicant's own disclosure and never defeat an intervening competitor filing. |
| What is Priya Menon's prescribed fix for the six-month design priority gap? | Enter the foreign six-month date in the docketing system the day the home application is filed and treat it as controlling in every non-US jurisdiction. |
| What happens if you miss the six-month mark when filing a Hague international application? | The international application simply proceeds without priority — no cure, no restoration. |

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