Prior Art Search Skill for Claude

Prior Art Search

Search patents and literature for prior art relevant to: $ARGUMENTS

Adapted from /research-lit for patent-specific searching.

Constants

• MAX_PATENT_RESULTS = 20 — Maximum patent documents to analyze in detail
• MAX_PAPER_RESULTS = 15 — Maximum academic papers to analyze in detail
• SEARCH_YEARS = 10 — How many years back to search
• PATENT_DATABASES = "google-patents, espacenet" — Patent databases to search

Inputs

Read the invention description from:

• $ARGUMENTS if it contains technical details
• patent/INVENTION_BRIEF.md if it exists
• INVENTION_BRIEF.md if it exists at project root

Shared References

Load ../shared-references/prior-art-databases.md for search strategy templates and IPC/CPC classification guidance.

Workflow

Step 1: Extract Search Concepts

From the invention description, identify:

• Core inventive concept: The primary technical contribution (1-2 sentences)
• Technical problem: What problem it solves
• Key technical features: 4-6 specific technical elements that define the invention
• IPC/CPC classes: Predict relevant classification codes (e.g., G06N, G06F)

Step 2: Patent Search

For EACH search concept, search via:

Google Patents (via WebSearch):

WebSearch: "site:patents.google.com [keywords]"
WebSearch: "[keywords] patent"

• Try primary keywords + technical problem keywords
• Search in English regardless of target jurisdiction
• For CN inventions, also search Chinese keywords via WebSearch

Espacenet (via WebFetch):

• WebFetch worldwide.espacenet.com/search results for key queries
• Search by predicted IPC/CPC classes

Assignee/Inventor Search:

• If known companies/universities work in this area, search their patent portfolios
• WebSearch: "[assignee name] patent [technical area]"

For each potentially relevant patent found:

• WebFetch the patent page to extract: title, abstract, representative claims, filing date, assignee, current status
• Record IPC/CPC classification codes

Step 3: Academic Literature Search

Search the same concepts in academic databases:

• Google Scholar (via WebSearch): WebSearch "[keywords] site:scholar.google.com"
• arXiv (via /arxiv if available, or WebSearch): Search for preprints
• Semantic Scholar (via /semantic-scholar if API key set, or WebSearch)

For each relevant paper found:

• Extract title, authors, venue, year, key contribution

Step 4: Classification and Analysis

For each reference found, assess:

• Relevance: How closely does it relate to the invention?
• Overlap Risk: Does it disclose the same or similar technical solution?
• HIGH: Anticipates one or more claim elements
• MEDIUM: Discloses a related but different approach
• LOW: Same general field, different approach
• Relationship: Is it anticipating, relevant, or merely background?

Organize results by IPC/CPC classification to see the technical landscape.

Step 5: Freedom-to-Operate Assessment (Preliminary)

Based on the search results:

• Identify patents with claims that potentially cover the invention
• Note any expired patents (public domain)
• Flag areas where claim scope overlap is significant

Disclaimer: This is a preliminary assessment only. A professional freedom-to-operate analysis by a patent attorney is recommended before filing.

Step 6: Output

Write patent/PRIOR_ART_REPORT.md with:

## Prior Art Search Report

### Invention Summary
[1-2 sentence description of the searched invention]

### Search Strategy
- Keywords used: [...]
- IPC/CPC classes searched: [...]
- Databases searched: Google Patents, Espacenet, Google Scholar, arXiv
- Date range: [year] to present

### Patent References Found

| # | Patent No. | Title | Date | Assignee | IPC/CPC | Key Teaching | Overlap Risk |
|---|-----------|-------|------|----------|---------|-------------|-------------|
| 1 | CN... / US... | [title] | [date] | [assignee] | [codes] | [2-3 sentences] | HIGH/MEDIUM/LOW |

### Non-Patent Literature Found

| # | Reference | Title | Authors/Venue | Year | Key Contribution | Relevance |
|---|-----------|-------|--------------|------|-----------------|-----------|
| 1 | [DOI/link] | [title] | [authors] | [year] | [1-2 sentences] | HIGH/MEDIUM/LOW |

### Prior Art Landscape
[Organized by technical approach or IPC class, not just chronological]

### Freedom-to-Operate Preliminary Assessment
[Which existing patents might block the invention? What is the risk level?]

### Recommendations
- Suggested claim scope adjustments based on prior art
- Areas where novelty appears strongest
- References to watch during prosecution

Key Rules

• Never fabricate patent numbers or citations. Mark uncertain references with [VERIFY].
• Search in English AND the target jurisdiction language (Chinese for CN).
• Patent prior art includes everything published before the priority date, not just patents.
• Academic papers are valid prior art for both novelty and inventive step.
• Include expired patents -- they are public domain but still relevant for novelty.