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PatentA patent search before filing saves money. Identifies prior art that could affect patentability.
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Patent Search Guide · File.Business

Patent search. Before you file.

Patent search identifies prior art that could affect your patentability. Done before filing, it can save significant money by avoiding doomed applications. Free tools (USPTO, Google Patents) + paid professional services.

Key facts

Start here.

Key fact
Free tools

USPTO Patent Public Search, Google Patents.

Key fact
Paid professional

$500-$2,000. More thorough; legal opinion possible.

Key fact
Classification

Patents are classified by USPC and CPC schemes. Helps narrow search.

Key fact
When to skip search

For provisional filing where you want priority date fast. Risk vs cost tradeoff.

Key fact
What you are looking for

Prior art that could prevent patenting your invention.

In depth

The full picture.

01

Why search before filing

Identifies prior art that could affect patentability. Helps refine claims to maximize chance of grant. Avoids spending $10k-$30k on doomed applications. Saves time and frustration.

02

Patent classification systems

US Patent Classification (USPC): older system, still indexed. Cooperative Patent Classification (CPC): newer, used by US and EPO. Patents are classified by subject matter; narrows search to relevant categories.

03

Free tools - USPTO Patent Public Search

patentcenter.uspto.gov. Updated continuously. Search by text, classification, applicant, inventor, date, status. Free.

04

Free tools - Google Patents

patents.google.com. Includes US + many international. Friendly interface. Free.

05

Free tools - EPO Espacenet

espacenet.com. European Patent Office search. Includes US + worldwide patents.

06

Search strategy

Identify keywords that describe your invention. Identify classifications. Search both free tools. Look at competitor patents in your space. Read referenced prior art in candidates you find.

07

Professional search services

Patent search firms ($500-$2,000) provide more thorough search and legal opinion. Useful for complex inventions or where high stakes warrant professional analysis.

08

What you find vs what you do not find

Search finds patents and published applications. May not find: pending applications not yet published (18-month rule); prior art outside patent literature (academic papers, products, blog posts).

09

When to skip search

For provisional applications where you want priority date fast and accept the risk. Some inventors do quick keyword searches and proceed. Risk vs cost decision.

FAQ

Common questions.

Should I do a search before filing?
Strongly recommended. Avoids doomed applications.
Free vs paid search?
Free covers most needs. Paid for high stakes or complex inventions.
What is USPC?
US Patent Classification. Subject-matter classification.
What is CPC?
Cooperative Patent Classification. Newer; used by US and EPO.
How long does a search take?
Hours for self-service; days for professional.
Will search find unpublished applications?
No. 18-month publication rule means recent applications may be invisible.
Do I need to disclose what I find?
Material prior art known to applicant must be disclosed to USPTO (Duty of Disclosure).
Can I use AI tools for search?
AI tools (Specifio, PQAI) emerging. Useful for initial scan; professional search still recommended for serious filings.

Need IP protection?

Patents (through our attorney network). Trademarks (we file). Copyright registration (we file). IP assignment templates (free).

Patent law is highly specialized. Professional patent attorney advice is essential for filing.

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