How to Find the Owner of a Patent
Patent ownership is public record — but patents change hands through assignments that may not be recorded promptly. Follow this 3-step process.
01
Step 1
Check the Patent Office Assignment Database
USPTO: assignment.uspto.gov — search by patent number for most recent recorded assignee. EPO: register.epo.org — shows patent proprietor. CNIPA: online system shows current patentee. WIPO: PATENTSCOPE shows applicant at each national phase entry.
USPTO AssignmentEPO RegisterCNIPAPATENTSCOPE
02
Step 2
Check for Unrecorded Assignments
Assignments aren't always recorded promptly. If the listed owner was acquired, merged, or dissolved: search SEC filings, Companies House, corporate registries, acquisition announcements, and bankruptcy filings to trace ownership changes.
03
Step 3
Contact the Owner
Reach out through: their patent attorney (listed in the prosecution file at the patent office), their corporate IP or business development department, or direct outreach via LinkedIn or company website.
⚠ Pitfalls to Avoid
Assuming the Listed Assignee Is Current
Patents change hands through acquisitions, mergers, and direct sales. The assignee recorded 5 years ago may no longer exist. Always trace the chain of title to the present.
Not Checking All Jurisdictions
The same patent family may have different recorded owners in different countries if assignments weren't recorded universally. Check each jurisdiction where the patent is in force.
Contacting Without Preparation
Before reaching out to a patent owner for licensing, know: what claims you're concerned about, what your product does differently, and what you're prepared to offer. Cold outreach without preparation wastes your leverage.