---
name: pct-application
title: PCT Application Skill
description: PCT international application preparation under PCT Rules 5-12 - unity of invention, formal requirements, national phase entry strategy, and deadline management
author: RobThePCGuy
author_url: https://github.com/RobThePCGuy/Claude-Patent-Creator/tree/main/skills/pct-application
license: MIT
version: 0.1.0
execution_mode: open
jurisdiction: general
practice: ip
language: en
---

# PCT Application Skill

Preparation and validation of Patent Cooperation Treaty (PCT) international applications under PCT Rules 5-12.

## When to Use

Invoke this skill when users ask to:
- Prepare a PCT international application
- Check PCT formalities compliance
- Assess unity of invention under Rule 13 PCT
- Plan national/regional phase entry strategy
- Calculate PCT fees and deadlines
- Convert a national application to PCT format
- Understand PCT procedure and timelines

## What This Skill Does

Provides comprehensive PCT application support:

1. **Application Preparation** (Rules 3-12 PCT):
   - Request form (PCT/RO/101) guidance
   - Description format (Rule 5 PCT)
   - Claims structure (Rule 6 PCT)
   - Abstract requirements (Rule 8 PCT)
   - Drawings standards (Rule 11 PCT)
   - Physical requirements (Rule 11 PCT)
   - Sequence listings (Rule 12 PCT, WIPO Standard ST.26)

2. **Unity of Invention** (Rule 13 PCT):
   - Single general inventive concept assessment
   - Special technical feature identification
   - Linking technical feature analysis
   - Unity objection risk assessment
   - Claim grouping strategy

3. **Formalities Validation** (Rules 3-12 PCT):
   - All formal requirements checking
   - Fee calculation per Receiving Office
   - Language requirements per RO
   - Physical document requirements

4. **National Phase Strategy**:
   - 30/31 month deadline tracking
   - Country selection guidance
   - Translation requirements per country
   - National phase fee estimates
   - Strategic filing considerations

## Required Data

**MCP Tools Available**:
- `check_pct_formalities` - PCT Rules 5-12 formalities checking
- `search_patent_law` - Search PCT rules, regulations, administrative instructions
- `search_patents_bigquery` - Prior art search for unity assessment

## How to Use

When this skill is invoked:

1. **Determine user's stage**:
   - New PCT filing from scratch
   - Converting national application to PCT
   - Reviewing existing PCT draft
   - Planning national phase entry

2. **For new applications, guide through**:
   - Invention disclosure review
   - Unity of invention assessment
   - Description drafting (Rule 5 format)
   - Claims structuring (Rule 6 format)
   - Abstract preparation (Rule 8)
   - Formalities checklist

3. **For review, analyze**:
   - All Rule 5-12 requirements
   - Unity of invention
   - Generate compliance report
   - Suggest fixes

## PCT Application Structure

### Request (Rule 4 PCT)

Form PCT/RO/101 requires:
- Applicant details (name, address, nationality, residence)
- Title of invention
- Priority claim(s) (if any, within 12 months)
- Designation of states (automatic for all since 2004)
- Choice of International Searching Authority (ISA)
- Agent/representative details

### Description (Rule 5 PCT)

Required sections in order:
```
1. Title of the Invention
2. Technical Field
3. Background Art
4. Disclosure of the Invention
   - Technical problem
   - Technical solution
   - Advantageous effects
5. Brief Description of Drawings
6. Best Mode for Carrying Out the Invention
7. Industrial Applicability
8. Sequence Listing (if applicable)
```

### Claims (Rule 6 PCT)

Structure requirements:
- Numbered consecutively in Arabic numerals
- Independent claims: define essential features of the invention
- Dependent claims: refer back and further limit
- Clear, concise, fully supported by description
- Multiple claim categories allowed (product, process, apparatus, use)
- Unity of invention required (Rule 13)

### Abstract (Rule 8 PCT)

- Maximum 150 words
- Indicate technical field
- Clear summary of technical problem, solution, and principal use
- Designate most illustrative figure
- Not used for interpreting claim scope

### Drawings (Rule 11 PCT)

- A4 paper (29.7cm x 21cm)
- Usable area: 26.2cm x 17cm
- Margins: top 2.5cm, left 2.5cm, right 1.5cm, bottom 1cm
- Black, dense, well-defined lines
- No text except single words
- Reference signs matching description

## Unity of Invention (Rule 13 PCT)

### Assessment Framework

Unity requires claims to relate to **one invention only** or a **group of inventions linked to form a single general inventive concept**.

**Test**: Do all claims share a **special technical feature** that:
1. Makes a contribution over the prior art, AND
2. Is present in all independent claims (or links them)

### Common Unity Patterns

**Unity Maintained**:
- Product + process for making product
- Product + use of product
- Process + apparatus specifically designed for process
- Product + process + apparatus (all sharing special technical feature)

**Unity at Risk**:
- Multiple independent claims without shared special technical feature
- Markush groups without common structural feature
- Method and apparatus addressing different problems

### Unity Strategy

```
Independent Claim 1 (System): A system comprising feature X...
Independent Claim 8 (Method): A method using feature X...
Independent Claim 15 (Use): Use of feature X for...

Special Technical Feature: "feature X" - shared across all groups
Unity: MAINTAINED (single general inventive concept linked by X)
```

## PCT Timeline

```
Month 0:  File PCT application at Receiving Office (RO)
Month 3:  International search begins (ISA)
Month 16: International Search Report (ISR) issued
Month 18: International publication (WIPO)
Month 22: Demand for preliminary examination (optional, Chapter II)
Month 28: International Preliminary Examination Report (IPER)
Month 30: National/regional phase entry deadline (most countries)
Month 31: National phase deadline (some countries: US, JP, etc.)
```

## Fee Calculation

### Base Fees (2025 estimates)

| Fee | Amount | Notes |
|-----|--------|-------|
| Transmittal fee | Varies by RO | RO/US: USD 280 |
| International filing fee | CHF 1,330 | Electronic reduction: -CHF 200 |
| Search fee | Varies by ISA | ISA/EP: EUR 1,775; ISA/US: USD 2,680 |
| Additional page fee | CHF 16/page | Beyond 30 pages |
| Additional claim fee | Varies | Beyond limits set by ISA |

### Electronic Filing Reduction

Filing via ePCT: CHF 200 reduction on international filing fee

### National Phase Fees (Estimates)

| Country | Entry Fee | Notes |
|---------|-----------|-------|
| US (371) | ~USD 1,600 | Basic filing + search + examination |
| EP (Euro-PCT) | ~EUR 2,595 | Filing + search + designation |
| JP | ~JPY 195,000 | National fee + translation |
| CN | ~CNY 3,500 | National fee + translation |
| KR | ~KRW 460,000 | National fee + translation |

## National Phase Strategy

### Key Decisions

1. **Which countries?** - Based on markets, competitors, manufacturing
2. **Which ISA?** - Affects search quality, cost, language
3. **Chapter II?** - Optional preliminary examination for stronger report
4. **Early national phase?** - Some countries allow before 30 months
5. **Translation strategy** - Cost and timing considerations

### Common Filing Strategies

**Broad Coverage**:
- US + EP + CN + JP + KR (covers ~85% of global patent value)

**Cost-Conscious**:
- US + EP only (defer others until commercial validation)

**Technology-Specific**:
- Pharma: US + EP + JP + CN + IN + BR
- Software: US + EP + JP + KR
- Manufacturing: US + EP + CN + DE + JP

## Compliance Report Format

```
PCT APPLICATION COMPLIANCE REPORT
====================================

Application: [Title]
Receiving Office: RO/[XX]
ISA Selected: ISA/[XX]

DESCRIPTION (Rule 5 PCT):
[PASS/FAIL] Title present
[PASS/FAIL] Technical field
[PASS/FAIL] Background art
[PASS/FAIL] Invention disclosure
[PASS/FAIL] Brief description of drawings
[PASS/FAIL] Best mode
[PASS/FAIL] Industrial applicability

CLAIMS (Rule 6 PCT):
[PASS/FAIL] Consecutively numbered
[PASS/FAIL] Supported by description
[PASS/FAIL] Clear and concise

UNITY OF INVENTION (Rule 13 PCT):
[PASS/WARN/FAIL] Single general inventive concept
Special technical feature: [identified feature]
Risk of unity objection: LOW/MEDIUM/HIGH

ABSTRACT (Rule 8 PCT):
[PASS/FAIL] Word count within 150
[PASS/FAIL] Figure designated
[PASS/FAIL] Technical field indicated

PHYSICAL REQUIREMENTS (Rule 11 PCT):
[PASS/FAIL] A4 format
[PASS/FAIL] Margins
[PASS/FAIL] Page numbering
[PASS/FAIL] Line spacing

FEES:
Transmittal: [amount]
International filing: [amount]
Search: [amount]
Total: [amount]

DEADLINES:
[Date] - Priority expires (12 months)
[Date] - Furnish priority doc (16 months)
[Date] - International publication (18 months)
[Date] - Chapter II demand (22 months)
[Date] - National phase entry (30/31 months)
```

## Integration

Works with other skills/agents:
- Uses **EPO Patent Analyzer** skill for Euro-PCT quality
- Coordinates with **EPO Patent Search** for EP prior art
- Invokes **EPC Search** skill for PCT rule research
- Uses **BigQuery Patent Search** for worldwide prior art

## Tools Available

- **Read**: To load application documents
- **Bash**: To run PCT compliance checks
- **Write**: To save compliance reports and application drafts
