Japanese Patent Attorney Deep Dive: From Paragraph Numbers to Accelerated Examination
CNIPA.AI Team
Tech Blog
The Japan Patent Office (JPO) operates one of the world's oldest and most distinctive patent systems. Japanese patent law differs significantly from the US 35 U.S.C., European EPC, and other major systems in format, procedure, and examination logic, presenting substantial adaptation challenges for cross-jurisdictional practitioners. This guide systematically addresses seven core JPO practice areas, with particular focus on institutional changes since 2022.
Target readers: Patent attorneys handling JP PCT national phase; multinational corporate IP teams building Japan market patent portfolios; international lawyers preparing for Japanese 弁理士 qualification.
1. Paragraph Numbering: The Mandatory Format of Form 29
1.1 Full-Width Brackets and Four-Digit Format
Japan Patent Act Enforcement Rules Form 29 (様式第29) requires each paragraph of the specification (明細書) to carry a four-digit paragraph number in full-width brackets, formatted as 【0001】, 【0002】, and so on continuously.
Format specifications:
- Correct:
【0001】 The present invention relates to a wireless communication device, and more particularly to a wireless communication device implementing a differential privacy mechanism. - Incorrect:
(0001) The present invention...(half-width brackets) - Incorrect:
【1】 The present invention...(fewer than four digits) - Incorrect: Non-continuous paragraph numbers (e.g., jumping from 【0003】 to 【0005】)
1.2 Scope of Paragraph Numbering
| Document Section | Paragraph Numbering Required? |
|---|---|
| Specification (明細書) | Yes (every paragraph must be numbered) |
| Scope of Claims (特許請求の範囲) | No (uses 【請求項１】 format) |
| Abstract (要約書) | No |
| Drawings (図面) | No |
Comparison with KR: Korean Patent Act Enforcement Rules similarly require full-width bracket paragraph numbers in the same format. This is the most immediately obvious formatting commonality between JPO and KIPO practice, offering convenience for JP-KR dual-jurisdiction applications.
1.3 Practical Workflow: Auto-Injection on Export
In actual practice, paragraph numbers are typically auto-injected at the final DOCX export stage, not added paragraph-by-paragraph during drafting. This is because editing drafts can easily cause numbering errors. Attorneys write the draft as an ordinary document and rely on software tools to add paragraph numbers uniformly at export.
2. Multi-Multi-Claim Prohibition: The Major 2022 Reform
2.1 Background
Effective 1 April 2022, the amended Patent Act explicitly prohibits "multi-multi-claim (マルチマルチクレーム)" claims—where a dependent claim references two or more dependent claims.
Before the prohibition (permitted before 31 March 2022):
【請求項３】 請求項１又は２に記載の装置において、
前記プロセッサがさらに…
(Claim 3 references Claims 1 or 2, both of which are dependent claims—previously legal)
After the prohibition (prohibited from 1 April 2022):
【請求項５】 請求項３又は４に記載の装置において、（prohibited）
(Claim 5 references Claims 3 and 4, which are themselves dependent claims—violates the prohibition)
2.2 Precise Boundary of the Prohibition
| Scenario | Compliant? |
|---|---|
| Dependent claim → independent claim (single reference) | Compliant |
| Dependent claim → multiple independent claims (e.g., "Claim 1 or 2" where 1 and 2 are both independent) | Compliant |
| Dependent claim → independent claim + dependent claim (mixed reference) | Non-compliant |
| Dependent claim → two or more dependent claims | Non-compliant |
2.3 Markush Claim Exception
Important exception: Markush-type claims may be exempt from this prohibition under certain conditions. JPO has specific handling rules for Markush claims in chemical/biotech fields. Practitioners handling JP chemical applications should separately consult JPO examination guidelines.
2.4 Comparison with US/EP
| Jurisdiction | Multiple Dependency Rule |
|---|---|
| JPO (after 2022) | Prohibits multi-multi-claims (マルチマルチ禁止) |
| KIPO (after 2022) | Similarly prohibited (다항인용다항 금지) |
| EPO | Permitted, with no additional fee (encouraged) |
| USPTO | Permitted, but each multiple dependent claim incurs approximately $860 surcharge |
| CNIPA | Permitted |
Practical impact: The dependent claim tree structures common in US drafting (e.g., Claim 5 referencing Claims 3 and 4) must be restructured for Japanese applications. The typical solution is to "flatten" multi-level dependencies to reference only the independent claim, or in appropriate cases to add a new independent claim.
3. Prohibition of New Matter (Patent Act Article 17-2)
3.1 Statutory Requirement
Patent Act Article 17-2, Paragraph 3 provides that amendments (補正) after filing must not introduce new matter (新規事項) beyond what was disclosed in the original filed specification, claims, and drawings (当初の明細書等).
3.2 High-Risk Scenarios for New Matter
| Amendment Type | New Matter Risk |
|---|---|
| Incorporating dependent claim features into independent claim | Low risk (generally supported) |
| Adding specific numerical values not present at filing | High risk |
| Combining features from multiple embodiments not presented as such | Medium-high risk |
| Adding entirely new embodiments | High risk (generally not permitted) |
| Deleting claim features (scope broadening) | Medium risk (must show support in original description) |
3.3 JP vs US § 132: A Critical Distinction
US § 132 (Continuation-in-Part, CIP) route: USPTO allows applicants to file a CIP application, adding new matter to an existing application's continuation while preserving the priority date for content in the original application.
No equivalent route in Japan: Japan has no CIP system. New matter can only be addressed by filing a new application (新出願), and the new content cannot claim the original application's priority date.
Practice recommendation: A critical Japanese 弁理士 practice is to "write a thick specification (明細書を厚く書く)" in the original application—incorporating all possible embodiments, numerical range endpoints, and alternative technical solutions into the original specification to preserve sufficient material for future amendments.
4. Prior Art Documents (先行技術文献): Disclosure Obligations and Format
4.1 Statutory Obligation
Patent Act Article 36, Paragraph 4, Item 2 requires that prior art documents known to the inventors (先行技術文献情報開示要件) be recorded in the specification. The specific format appears in the 【先行技術文献】 section of JPO Form 29.
Standard section structure:
【先行技術文献】
【特許文献】
【特許文献１】 特開２０２３－１２３４５６号公報
【特許文献２】 United States Patent No. 10,123,456
【非特許文献】
【非特許文献１】 Ichiro Tanaka, "Pattern Recognition Using Machine Learning," IPSJ Journal, Vol. 63, No. 2, pp. 123-134, 2022
4.2 JP Prior Art Documents vs US IDS Comparison
| Dimension | JP (先行技術文献) | US (IDS) |
|---|---|---|
| Timing | At filing or during amendment | Specific time windows (within 3 months of filing, before examination action, etc.) |
| Source | Documents known to inventors | All relevant documents known to attorney and inventors |
| Format | Fixed section format (【特許文献】/【非特許文献】) | Prescribed forms (PTO/SB/08A etc.) |
| Consequence of non-disclosure | Claims may be rejected | Patent may be invalidated (inequitable conduct) |
5. Reference Sign Description (符号の説明)
5.1 Format Requirements
JPO Form 29 requires the 【符号の説明】 section at the end of the specification to list all reference numerals used in the drawings along with their corresponding technical feature names.
Standard format:
【符号の説明】
【0089】
10 Wireless communication device
11 Processor
12 Memory
13 Antenna
20 Base station
30 Server
5.2 Distinction from EP Rule 43(7)
| Dimension | JP (符号の説明) | EP (Rule 43(7) reference signs) |
|---|---|---|
| Location | Independent section at end of specification | Within claim text (in parentheses) |
| Purpose | Drawing reference numeral index | Correspondence between claim features and drawings |
| Format | numeral + space + name | name + (numeral) |
| Mandatory basis | JPO Form 29 requirement | EPC Rule 43(7) requirement |
6. Examination Request System: 3-Year Deadline and Accelerated Examination Paths
6.1 3-Year Examination Request Deadline
Patent Act Article 48-3 provides that applicants must submit a Request for Examination (出願審査請求) and pay the examination fee within 3 years from the filing date (for foreign priority applications, calculated from the earliest priority date). Failure to request examination within the deadline is deemed withdrawal.
Fee structure (2024 basis):
- Basic examination request fee: approximately JPY 118,000
- Additional fee per claim: approximately JPY 4,000
Reduction categories:
| Applicant Type | Reduction Rate |
|---|---|
| Individual inventors | 50% |
| Small and medium enterprises | 50% |
| SME startups | Approximately 2/3 |
| Universities and research institutions | Generally reduced |
| Large corporations | No reduction |
6.2 Early Examination and Super-Accelerated Examination
JPO offers two acceleration mechanisms:
Early Examination (早期審査—Accelerated Examination):
- Eligibility: Currently implementing or preparing to implement the invention, foreign corresponding application (US/EP/CN), small/medium enterprises or startups, etc.
- Application procedure: Submit a "Statement of Circumstances Relating to Early Examination (早期審査に関する事情説明書)"
- Expected timeline: Approximately 6-9 months for examination (standard process: approximately 24-30 months)
Super-Accelerated Examination (スーパー早期審査):
- Eligibility: Applicant is implementing the invention and has already requested early examination
- Expected timeline: Approximately 2-3 months (extremely fast)
- Practice note: Examiners under this path require high applicant responsiveness; Office Actions must be responded to within very short timeframes
6.3 Patent Prosecution Highway (PPH)
JPO has PPH agreements with all major patent offices: if an applicant has allowed claims at US/EP/CN, they can request PPH accelerated examination at JPO, typically significantly shortening the waiting period.
PPH eligibility conditions:
- A cooperating office (e.g., USPTO) has issued a Notice of Allowance or equivalent
- The JP application's corresponding claims are of equal or narrower scope than the allowed claims at the cooperating office
7. Utility Model vs Patent: Strategic Choice Framework
7.1 System Comparison
| Dimension | Patent (特許) | Utility Model (実用新案) |
|---|---|---|
| Protected subject matter | Products, methods, uses | Only "shape, structure, or combination of articles" (no methods or substances) |
| Examination method | Substantive examination | No substantive examination (registered after formalities examination only) |
| Registration speed | Approximately 24-30 months | Approximately 2-3 months |
| Protection term | 20 years | 10 years |
| Technical evaluation | Not applicable | Technical Evaluation Certificate required before enforcing utility model right |
7.2 Invention Types Not Suitable for Utility Model
The following invention types cannot be protected as utility models:
- Pure method inventions (e.g., manufacturing methods, signal processing methods)
- Chemical substances/compositions
- Software/business methods (no physical form)
7.3 Strategic Value of Utility Model
The core strategic value of utility model protection is rapid right acquisition: registration in approximately 2-3 months, suitable for:
- Consumer products with short product lifecycles requiring quick rights
- Interim protection while main patent application is under examination
- Fields where technology changes rapidly and 20-year protection is less meaningful
8. How CNIPA.AI Assists in the Japanese Patent Process
Japanese patent application format complexity ranks among the highest of major patent offices. Here are specific scenarios where AI tools can add value in JP practice:
Format compliance automation:
- Paragraph number continuity checking (auto-detect numbering gaps or duplicates)
- Full-width bracket format verification (【０００１】 vs (0001))
- Multi-multi-claim automatic detection (flag dependent claim reference relationships violating the prohibition)
Specification structure generation:
- Auto-generate 【先行技術文献】 section (with 【特許文献】 and 【非特許文献】 subsections)
- Generate 【符号の説明】 section (extract reference numerals from drawing information)
- 【発明の効果】 section completeness checking
Examination request management:
- Automatically calculate examination request deadline (filing date + 3 years)
- Early examination eligibility pre-assessment (based on application type and implementation status)
These functions are assistive tools. Final legal judgments (new matter assessment, claim interpretation) remain the responsibility of qualified Japanese 弁理士.
Appendix: Patent Act Key Provisions and Format Quick Reference
| Provision/Form | Subject | Core Requirements |
|---|---|---|
| Patent Act Art. 36 | Specification and Scope of Claims | Detailed description: POSITA can carry out invention; Claims: concise, clear, and supported |
| Patent Act Art. 17-2 | Amendments | Prohibited from introducing matter beyond scope of original filing |
| Patent Act Art. 36-4, Item 2 | Prior Art Disclosure | Documents known to inventors must be recorded in specification |
| Patent Act Art. 48-3 | Examination Request | Must be filed within 3 years of filing date; deemed withdrawn if not |
| Utility Model Act Art. 7-2 | Protected Subject Matter | Only shape, structure, combination of articles |
| Form 29 | Specification Format | Paragraph numbers 【0001】, section headings 【技術分野】, etc. |
| Enforcement Rules Art. 24-2 | Multi-Multi-Claim Prohibition | Effective 1 April 2022 |
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