How to Do a Patent Search Before Filing (Free Tools and Tips)

A preliminary patent search shows whether similar inventions already exist and helps you describe what makes yours different.

Start with keywords

List the function, the parts and synonyms. Search for what the device does, not just what you call it.

Use CPC classes

The Cooperative Patent Classification groups patents by technology. Once you find one relevant patent, search its classes for neighbors.

Free databases

Google Patents and USPTO Patent Public Search are free. Read the claims and drawings of the closest results.

Use the results

Do not give up when you find something similar. Write down the differences; they often become the core of your description and claims.

SI-guided search

GetQuickPatent's patent search suggests keywords, CPC classes, overlapping concepts and differentiators, with a Deeper Search option. It is a starting point, not a professional patentability opinion.