How do I search for patents by a specific field (such as patent expiration status or assignee)?
From the Boolean Text page, click the “All Fields” pull-down menu to view and choose the exact field you want to search, or go straight to the Advanced search page, where all the fields are presented in document format. Advanced searchers can use our search language to type exact search criteria directly into the search box on our home page, the first line of a Boolean Text search (with “All Fields” selected), or the first search box of the Advanced search page. (Note the date field is PD, or “publication date”). Consult The Basics of Creating and Refining Queries for instructions and specific examples.
