Prior art search: a practical playbook before you file

A strong prior art search is the foundation of a defensible patent. It tells you whether an invention is genuinely novel, shapes how you draft claims, and prevents costly surprises during examination. Here is how to run one that holds up.

1. Define the invention precisely

Start by reducing the invention to its essential technical features. Vague descriptions produce noisy results; precise feature sets produce relevant ones. List the problem solved, the core mechanism and the distinguishing elements.

2. Search broadly, then narrow

Cover patent databases (USPTO, EPO Espacenet, WIPO PatentScope) and non-patent literature (journals, conference papers, standards, product manuals). Prior art is not limited to patents — any public disclosure counts.

3. Use classification, not just keywords

Keyword-only searches miss synonyms and translations. Combine keywords with classification codes (CPC / IPC) and citation chaining to surface the documents examiners will find.

4. Document everything

• Record each query, database and date.
• Capture the most relevant references with full bibliographic data.
• Map each reference to the specific claim features it discloses.

5. Assess novelty and obviousness

For each close reference, ask: does it disclose every feature (anticipation), or could it be combined with others to render the invention obvious? This analysis drives claim strategy.

PatentPaper builds prior-art search and documentation directly into every patent paper, so the novelty story is defensible from the first draft.