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Japan Design Patent (Isho): Foreign Counsel Filing Guide
Japan offers one of the strongest design protection regimes globally, with 25-year term, partial design, related design, and Hague Agreement access. For foreign counsel handling consumer products, fashion, automotive, or electronics, Japan design patents are strategic assets that complement utility patents and trademarks.
Table of Contents
Japan Design Patent Overview
Japan design patents protect industrial designs (意匠) — the visual appearance of articles, including shape, pattern, color, and combinations thereof. The current regime, modernized by the 2020 reform, covers:
- Whole article designs: The entire product appearance
- Partial designs (部分意匠): A portion of an article
- Related designs (関連意匠): Design variations under one principal
- Graphic image designs: GUI, icons, projected images (since 2020)
- Building designs (建築物の意匠): Exterior architecture (since 2020)
- Interior designs: Coordinated interior compositions (since 2020)
Term Update: Effective April 2020, the design patent term is 25 years from filing date (previously 20 years from registration). This makes Japan one of the longest design protection terms globally.
Filing via Hague Agreement
Foreign counsel can designate Japan in a Hague Agreement (1999 Geneva Act) international application. Filing process:
- File international application with WIPO: Designate Japan as a contracting party. Single application, single fee, single language (English).
- WIPO formal examination: Within 6 months of publication.
- Japan national phase: The JPO substantively examines the design. Office actions are common and require local counsel.
- Grant and registration: Japan-specific registration is recorded.
| Aspect | Direct Filing | Hague Filing |
|---|---|---|
| Initial language | Japanese only | English/Spanish/French |
| Filing fee | ¥16,000 | CHF 397 base + per-country |
| Examination duration | 6-8 months | 6-12 months (Japan phase) |
| Local counsel needed | For filing | Only for office actions |
| Best for | Single-country Japan strategy | Multi-country portfolios |
Special Design Types
Partial Design (部分意匠)
Partial design allows you to claim only a portion of an article. The application shows the claimed portion in solid lines and the unclaimed portion (article boundary context) in broken lines. This is powerful for designs where the key visual feature is one element — for example, a distinctive heel of a shoe or the speaker grille of a phone.
Related Design (関連意匠)
Related design is unique to Japan. After filing a principal design, you can file related designs that are similar variations under one principal. The 2020 reform extended the related design filing window from "within 8 months of principal publication" to "within 10 years of principal filing date," dramatically expanding strategic options.
Strategic Use: Use related design to build a "design family" around a successful product. Each related design strengthens the principal and creates broader market exclusion. Example: a flagship car model can be protected by 5-10 related designs covering different angles, trim levels, and special editions.
Graphic Image Design
Since 2020, standalone GUI/icon designs are protectable even without being displayed on a specific article. This is essential for SaaS, mobile apps, and IoT products.
Examination Process
- Filing: Submit application with drawings (6 views: front, back, top, bottom, left, right; perspective optional).
- Formality examination (1-2 months): Check for completeness.
- Substantive examination (6-8 months from filing): Examiner reviews novelty, distinctiveness, and similarity to prior designs.
- Office action (if rejection): Respond within 3 months (60-day extension available).
- Registration: Pay 1st year fee at allowance.
- Publication: Design is published in the Design Gazette upon registration.
Enforcement & Damages
Japan design patents are enforced through the IP High Court (IPHC) and District Courts. Key enforcement features:
- Similarity test: Infringement covers identical AND similar designs (broader than pure copy).
- Presumption of damages: Article 39 provides lost-profit calculation based on infringer's sales.
- Injunctions: Available without showing irreparable harm.
- Customs detention: Japan Customs actively detains infringing imports.
- Criminal enforcement: Willful infringement is criminal (up to 10 years imprisonment or ¥10M fine).
2020 Reform Updates
The 2020 Design Act reform (effective April 1, 2020) modernized the system:
| Change | Before | After |
|---|---|---|
| Term | 20 years from registration | 25 years from filing |
| Related design window | 8 months | 10 years |
| Image design | Required article display | Standalone graphic protected |
| Building/interior | Not eligible | Eligible |
| Indirect infringement | Limited | Expanded scope |
| Damages calculation | Restrictive | Enhanced calculation methods |
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Q. What is a Japan design patent?
A. Japan design patents (意匠権/ishoken) protect the visual appearance of articles — shape, pattern, color, or combination. Granted under the Design Act (意匠法), they last 25 years from filing date.
Q. Can I file a Japan design via the Hague Agreement?
A. Yes. Japan joined the Hague Agreement in May 2015. You can designate Japan in a single international application via WIPO, then prosecute the Japanese phase.
Q. What is a "related design" (関連意匠)?
A. Related design is a unique Japanese institution allowing variations of a principal design to be registered under one principal. Variations need only be similar to the principal, not novel. Filing window: within 10 years of principal design filing date (extended by 2020 reform).
Q. What is a "partial design" (部分意匠)?
A. Partial design protects only a portion of an article — for example, just the camera bezel area of a phone. Solid lines show the claimed part; dotted lines show the article boundaries.
Q. How long does Japan design examination take?
A. Typically 6-8 months to first action. Examiners check for novelty, distinctiveness, and similarity to prior designs. Office actions are common; response strategy mirrors patent prosecution.