Support : Publications : Chronolog Archives : March/April 2005

A Comprehensive Patent Ownership Search

To find all U.S. patents owned by a company, it is not enough to simply do a patent assignee (PA=) search in the U.S. patent files. Files 652 and 654 have specialized prefixes to help include in the search results all companies that are affected by legal status changes recorded at the USPTO.

Use the RA= field to search for patents reassigned to a specific company. Use the RG= field for all patents where the company searched has assigned their patent rights to another person or company.

For example, if you are looking for all patents assigned to Dialog, you would expand on the PA=, RA= and RG= fields. The expansions result in sets 1 (PA=), 2 (RA=), and 3 (RG=). OR sets 1 and 2 together, NOT out set 3 (s s1:s2 not s3) and you will have a comprehensive list of the patents owned by a company.

Jeannie Wainwright
Knowledge Center

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