How do I search for a particular patent class or subclass?
Using the Advanced search function, enter the U.S. Patent or International Patent Classification Code as the search criteria. Alternatively, from the Integrated View of any patent in your result set, click on the IPC, US Class or ECLA Code link to view all the patents in that particular class. To browse IPC, US Class, or Derwent codes, select the Browse Codes option from the main search navigation.
