The Classification disc (CLASS) of the Classification and Search Support Information System (CASSIS) provides access to U.S. patent classification information for all Utility,Design, Plant, Reissue and x-numbered patents as well as Defensive publications and Statutory Invention Registrations issued
from 1790 to the present. CASSIS/CLASS can be used to
- find the current U.S. Classification of a patent
- list all the patents in one or more U.S. classifications
- determine the number of patent currently in one or more U.S. Classification.