Search Prior Art
Run structured prior art search to find publications, patents, products, disclosures predating specific invention. Used to assess patentability (can this be patented?), challenge validity (should this patent have been granted?), or establish freedom-to-operate (is this design covered by existing rights?).
When Use
- Evaluating whether invention is novel + non-obvious before filing patent
- Challenging validity of existing patent by finding prior art examiner missed
- Supporting freedom-to-operate analysis by finding prior art that limits blocking patent's scope
- Documenting defensive publication to prevent others from patenting concept
- Responding to patent office action that questions novelty or obviousness
Inputs
- Required: Invention description (what does, how works, what problem solves)
- Required: Search purpose (patentability, invalidity, FTO, defensive)
- Required: Critical date (filing date of patent app, or invention date for prior art)
- Optional: Known related patents or publications
- Optional: Tech classification codes (IPC, CPC)
- Optional: Key inventors or companies in field
Steps
Step 1: Decompose Invention into Searchable Elements
Break invention into constituent technical features.
- Read invention description (or patent claims if searching against existing patent)
- Extract essential elements — each independent technical feature.
- What components does it have?
- What steps does process follow?
- What technical effect does it achieve?
- What problem does it solve and how?
- Identify novel combination — what makes this different from known art.
- New element added to known elements?
- New combination of known elements?
- Known element applied in new field?
- Generate search terms per element.
- Technical terms, synonyms, abbreviations
- Broader + narrower terms (hierarchy)
- Alternative descriptions of same concept
- Document Search Map: elements, terms, relationships
Search Map Example:
+------------------+-----------------------------------+-----------+
| Element | Search Terms | Priority |
+------------------+-----------------------------------+-----------+
| Attention layer | attention mechanism, self- | High |
| | attention, multi-head attention | |
| Sparse routing | mixture of experts, sparse MoE, | High |
| | top-k routing, expert selection | |
| Training method | knowledge distillation, teacher- | Medium |
| | student, progressive training | |
+------------------+-----------------------------------+-----------+
Got: Complete decomposition with search terms per element. Novel combination identified — this is what search must either find (to invalidate) or confirm absent (to support novelty).
If fail: Invention too abstract to decompose? Ask for more specific description. Claims unclear? Focus on broadest reasonable interpretation of each claim element.
Step 2: Search Patent Literature
Search patent databases systematically.
- Construct queries combining element terms.
- Search each element individually first (broad)
- Then combine elements to find closer art (narrow)
- Use classification codes to filter by tech area
- Search multiple databases.
- Google Patents: Good for full-text search, free, large corpus
- USPTO PatFT/AppFT: US patents + applications, official source
- Espacenet: European patents, excellent classification search
- WIPO Patentscope: PCT applications, global coverage
- Apply date filters.
- Prior art must predate critical date (filing date or priority date)
- Include publications up to 1 year before filing (grace period varies by jurisdiction)
- For each relevant result, record.
- Document number, title, filing date, publication date
- Which elements it discloses (map to Search Map)
- Whether it discloses novel combination
- Classify results by relevance.
- X reference: Discloses invention alone (anticipation)
- Y reference: Discloses key elements, combinable with other refs (obviousness)
- A reference: Background art, defines general state of art
Got: Classified list of patent references mapped to invention elements. X references (if found) = showstoppers for novelty. Y references = building blocks for obviousness arguments.
If fail: No relevant patent art found? Does not mean novel — non-patent literature (Step 3) may have critical reference. Absence in one database does not mean absence everywhere.
Step 3: Search Non-Patent Literature
Search academic papers, products, open source, other non-patent disclosures.
- Academic literature.
- Google Scholar, arXiv, IEEE Xplore, ACM Digital Library
- Search using same terms from Step 1
- Conference papers + workshop proceedings often predate patent filings
- Products and commercial disclosures.
- Product docs, user manuals, marketing materials
- Internet Archive (Wayback Machine) for date-verified web content
- Trade publications + press releases
- Open source and code.
- GitHub, GitLab — search for implementations of technical features
- README files, docs, commit histories for date evidence
- Software releases with version dates
- Standards and specifications.
- IEEE, IETF (RFCs), W3C, ISO standards
- Standards-essential patents must be disclosed; search standard bodies' IP databases
- Defensive publications.
- IBM Technical Disclosure Bulletin
- Research Disclosure journal
- IP.com Prior Art Database
- For each result, verify publication date before critical date.
- Web pages: use Wayback Machine for date evidence
- Software: use release dates or commit timestamps
- Papers: use publication date, not submission date
Got: Non-patent references that complement patent search. Academic papers + open-source code often most powerful prior art — describe technical details more explicitly than patents.
If fail: Non-patent literature sparse? Tech may be primarily developed in corporate R&D (patent-heavy). Shift emphasis to patent literature, focus on combination-based obviousness argument.
Step 4: Analyze and Map Results
Evaluate how collected prior art relates to invention.
- Make claim chart mapping prior art to invention elements.
Claim Element vs. Prior Art Matrix:
+------------------+--------+--------+--------+--------+
| Element | Ref #1 | Ref #2 | Ref #3 | Ref #4 |
+------------------+--------+--------+--------+--------+
| Element A | X | X | | X |
| Element B | | X | X | |
| Element C | X | | X | |
| Novel combo A+B+C| | | | |
+------------------+--------+--------+--------+--------+
X = element disclosed in this reference
- Assess novelty: Does any single reference disclose all elements?
- If yes → invention anticipated (not novel)
- If no → invention may be novel (proceed to obviousness)
- Assess obviousness: Can small number of references (2-3) be combined to cover all elements?
- Motivation to combine? (would skilled person see reason to combine these?)
- References teach away from combination? (suggest it would not work?)
- For FTO searches: Does prior art narrow blocking patent's claims?
- Prior art that overlaps with blocking patent's claims limits enforceable scope
- Document analysis clear with citation to specific passages
Got: Clear claim chart showing which elements covered by which references, with assessment of novelty + obviousness. Each mapping cites specific passages or figures.
If fail: Claim chart shows gaps (elements not in any prior art)? Those gaps = potentially novel aspects. Focus follow-up searches on those specific gaps.
Step 5: Document and Deliver
Package search results for intended use.
- Write Prior Art Search Report.
- Purpose + scope of search
- Search methodology (databases, queries, date ranges)
- Results summary (number of references found, classification breakdown)
- Top references with detailed analysis (claim charts)
- Assessment: novelty, obviousness, FTO implications
- Limitations + recommendations for further search
- Organize references.
- Sorted by relevance (X first, then Y, then A)
- Each reference with full bibliographic data + access link
- Key passages highlighted or extracted
- Recommendations by search purpose.
- Patentability: File/don't file, suggested claim scope based on prior art gaps
- Invalidity: Strongest combination of references, suggested legal argument
- FTO: Risk level, design-around opportunities, licensing considerations
- Defensive: Whether to publish as defensive disclosure based on white space found
Got: Complete, well-organized search report that supports intended decision. References accessible, analysis traceable.
If fail: Search inconclusive (no strong X or Y, but some background)? State conclusion clear: "No anticipatory art found; closest art addresses elements A and B but not C. Recommend filing with claims emphasizing element C." Inconclusive = valid + useful result.
Checks
Pitfalls
- Keyword tunnel vision: Search only exact terms misses synonyms + alternative descriptions. Use term hierarchy from Step 1
- Patent-only search: Non-patent literature (papers, products, code) often more explicit than patents. Do not skip Step 3
- Date carelessness: Prior art must predate critical date. Brilliant reference from one day after filing date worthless
- Ignore foreign language art: Major inventions may first appear in Chinese, Japanese, Korean, German patent literature. Machine translation makes these searchable
- Confirmation bias: Search to confirm novelty rather than find invalidating art. Best search tries hardest to find closest art
- Stop too early: First few results rarely best. Iterate search terms based on what early results reveal about field's vocabulary
See Also
assess-ip-landscape — Broader landscape mapping that contextualizes specific prior art searchesscreen-trademark — Trademark-specific conflict screening (different databases, different legal framework than patent prior art)file-trademark — Trademark filing procedures for when screening completereview-research — Literature review methodology overlaps significant with prior art searchsecurity-audit-codebase — Systematic search methodology parallels (thoroughness, documentation, reproducibility)
1---2name: search-prior-art-pjt2223description: Search for prior art relevant to a specific invention or patent claim. Covers patent literature, non-patent literature (academic papers, products, open source), defensive publications, and standard-essential patents. Use when evaluating whether an invention is novel and non-obvious before filing, challenging the validity of an existing patent, supporting a freedom-to-operate analysis, documenting a defensive publication, or responding to a patent office action questioning novelty or obviousness.4license: MIT5---67# Search Prior Art89Run structured prior art search to find publications, patents, products, disclosures predating specific invention. Used to assess patentability (can this be patented?), challenge validity (should this patent have been granted?), or establish freedom-to-operate (is this design covered by existing rights?).1011## When Use1213- Evaluating whether invention is novel + non-obvious before filing patent14- Challenging validity of existing patent by finding prior art examiner missed15- Supporting freedom-to-operate analysis by finding prior art that limits blocking patent's scope16- Documenting defensive publication to prevent others from patenting concept17- Responding to patent office action that questions novelty or obviousness1819## Inputs2021- **Required**: Invention description (what does, how works, what problem solves)22- **Required**: Search purpose (patentability, invalidity, FTO, defensive)23- **Required**: Critical date (filing date of patent app, or invention date for prior art)24- **Optional**: Known related patents or publications25- **Optional**: Tech classification codes (IPC, CPC)26- **Optional**: Key inventors or companies in field2728## Steps2930### Step 1: Decompose Invention into Searchable Elements3132Break invention into constituent technical features.33341. Read invention description (or patent claims if searching against existing patent)352. Extract **essential elements** — each independent technical feature.36 - What components does it have?37 - What steps does process follow?38 - What technical effect does it achieve?39 - What problem does it solve and how?403. Identify **novel combination** — what makes this different from known art.41 - New element added to known elements?42 - New combination of known elements?43 - Known element applied in new field?444. Generate search terms per element.45 - Technical terms, synonyms, abbreviations46 - Broader + narrower terms (hierarchy)47 - Alternative descriptions of same concept485. Document **Search Map**: elements, terms, relationships4950```51Search Map Example:52+------------------+-----------------------------------+-----------+53| Element | Search Terms | Priority |54+------------------+-----------------------------------+-----------+55| Attention layer | attention mechanism, self- | High |56| | attention, multi-head attention | |57| Sparse routing | mixture of experts, sparse MoE, | High |58| | top-k routing, expert selection | |59| Training method | knowledge distillation, teacher- | Medium |60| | student, progressive training | |61+------------------+-----------------------------------+-----------+62```6364**Got:** Complete decomposition with search terms per element. Novel combination identified — this is what search must either find (to invalidate) or confirm absent (to support novelty).6566**If fail:** Invention too abstract to decompose? Ask for more specific description. Claims unclear? Focus on broadest reasonable interpretation of each claim element.6768### Step 2: Search Patent Literature6970Search patent databases systematically.71721. Construct queries combining element terms.73 - Search each element individually first (broad)74 - Then combine elements to find closer art (narrow)75 - Use classification codes to filter by tech area762. Search multiple databases.77 - **Google Patents**: Good for full-text search, free, large corpus78 - **USPTO PatFT/AppFT**: US patents + applications, official source79 - **Espacenet**: European patents, excellent classification search80 - **WIPO Patentscope**: PCT applications, global coverage813. Apply date filters.82 - Prior art must predate **critical date** (filing date or priority date)83 - Include publications up to 1 year before filing (grace period varies by jurisdiction)844. For each relevant result, record.85 - Document number, title, filing date, publication date86 - Which elements it discloses (map to Search Map)87 - Whether it discloses novel combination885. Classify results by relevance.89 - **X reference**: Discloses invention alone (anticipation)90 - **Y reference**: Discloses key elements, combinable with other refs (obviousness)91 - **A reference**: Background art, defines general state of art9293**Got:** Classified list of patent references mapped to invention elements. X references (if found) = showstoppers for novelty. Y references = building blocks for obviousness arguments.9495**If fail:** No relevant patent art found? Does not mean novel — non-patent literature (Step 3) may have critical reference. Absence in one database does not mean absence everywhere.9697### Step 3: Search Non-Patent Literature9899Search academic papers, products, open source, other non-patent disclosures.1001011. **Academic literature**.102 - Google Scholar, arXiv, IEEE Xplore, ACM Digital Library103 - Search using same terms from Step 1104 - Conference papers + workshop proceedings often predate patent filings1052. **Products and commercial disclosures**.106 - Product docs, user manuals, marketing materials107 - Internet Archive (Wayback Machine) for date-verified web content108 - Trade publications + press releases1093. **Open source and code**.110 - GitHub, GitLab — search for implementations of technical features111 - README files, docs, commit histories for date evidence112 - Software releases with version dates1134. **Standards and specifications**.114 - IEEE, IETF (RFCs), W3C, ISO standards115 - Standards-essential patents must be disclosed; search standard bodies' IP databases1165. **Defensive publications**.117 - IBM Technical Disclosure Bulletin118 - Research Disclosure journal119 - IP.com Prior Art Database1206. For each result, verify **publication date** before critical date.121 - Web pages: use Wayback Machine for date evidence122 - Software: use release dates or commit timestamps123 - Papers: use publication date, not submission date124125**Got:** Non-patent references that complement patent search. Academic papers + open-source code often most powerful prior art — describe technical details more explicitly than patents.126127**If fail:** Non-patent literature sparse? Tech may be primarily developed in corporate R&D (patent-heavy). Shift emphasis to patent literature, focus on combination-based obviousness argument.128129### Step 4: Analyze and Map Results130131Evaluate how collected prior art relates to invention.1321331. Make **claim chart** mapping prior art to invention elements.134135```136Claim Element vs. Prior Art Matrix:137+------------------+--------+--------+--------+--------+138| Element | Ref #1 | Ref #2 | Ref #3 | Ref #4 |139+------------------+--------+--------+--------+--------+140| Element A | X | X | | X |141| Element B | | X | X | |142| Element C | X | | X | |143| Novel combo A+B+C| | | | |144+------------------+--------+--------+--------+--------+145X = element disclosed in this reference146```1471482. Assess **novelty**: Does any single reference disclose all elements?149 - If yes → invention anticipated (not novel)150 - If no → invention may be novel (proceed to obviousness)1513. Assess **obviousness**: Can small number of references (2-3) be combined to cover all elements?152 - Motivation to combine? (would skilled person see reason to combine these?)153 - References teach away from combination? (suggest it would not work?)1544. For **FTO searches**: Does prior art narrow blocking patent's claims?155 - Prior art that overlaps with blocking patent's claims limits enforceable scope1565. Document analysis clear with citation to specific passages157158**Got:** Clear claim chart showing which elements covered by which references, with assessment of novelty + obviousness. Each mapping cites specific passages or figures.159160**If fail:** Claim chart shows gaps (elements not in any prior art)? Those gaps = potentially novel aspects. Focus follow-up searches on those specific gaps.161162### Step 5: Document and Deliver163164Package search results for intended use.1651661. Write **Prior Art Search Report**.167 - Purpose + scope of search168 - Search methodology (databases, queries, date ranges)169 - Results summary (number of references found, classification breakdown)170 - Top references with detailed analysis (claim charts)171 - Assessment: novelty, obviousness, FTO implications172 - Limitations + recommendations for further search1732. Organize references.174 - Sorted by relevance (X first, then Y, then A)175 - Each reference with full bibliographic data + access link176 - Key passages highlighted or extracted1773. Recommendations by search purpose.178 - **Patentability**: File/don't file, suggested claim scope based on prior art gaps179 - **Invalidity**: Strongest combination of references, suggested legal argument180 - **FTO**: Risk level, design-around opportunities, licensing considerations181 - **Defensive**: Whether to publish as defensive disclosure based on white space found182183**Got:** Complete, well-organized search report that supports intended decision. References accessible, analysis traceable.184185**If fail:** Search inconclusive (no strong X or Y, but some background)? State conclusion clear: "No anticipatory art found; closest art addresses elements A and B but not C. Recommend filing with claims emphasizing element C." Inconclusive = valid + useful result.186187## Checks188189- [ ] Invention decomposed into distinct searchable elements190- [ ] Novel combination explicit identified191- [ ] Patent databases searched (min 2 databases)192- [ ] Non-patent literature searched (academic + products + open source)193- [ ] All references predate critical date (dates verified)194- [ ] Claim chart maps elements to references with passage citations195- [ ] Novelty + obviousness assessed with reasoning196- [ ] Results classified by relevance (X, Y, A references)197- [ ] Report includes methodology, limitations, recommendations198- [ ] Search reproducible (queries + databases documented)199200## Pitfalls201202- **Keyword tunnel vision**: Search only exact terms misses synonyms + alternative descriptions. Use term hierarchy from Step 1203- **Patent-only search**: Non-patent literature (papers, products, code) often more explicit than patents. Do not skip Step 3204- **Date carelessness**: Prior art must predate critical date. Brilliant reference from one day after filing date worthless205- **Ignore foreign language art**: Major inventions may first appear in Chinese, Japanese, Korean, German patent literature. Machine translation makes these searchable206- **Confirmation bias**: Search to confirm novelty rather than find invalidating art. Best search tries hardest to find closest art207- **Stop too early**: First few results rarely best. Iterate search terms based on what early results reveal about field's vocabulary208209## See Also210211- `assess-ip-landscape` — Broader landscape mapping that contextualizes specific prior art searches212- `screen-trademark` — Trademark-specific conflict screening (different databases, different legal framework than patent prior art)213- `file-trademark` — Trademark filing procedures for when screening complete214- `review-research` — Literature review methodology overlaps significant with prior art search215- `security-audit-codebase` — Systematic search methodology parallels (thoroughness, documentation, reproducibility)
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