These are proceedings before the Trademark Trial and Appeal Board (TTAB) at the U.S. Patent and Trademark Office (USPTO). Conflicts over whether a trademark can be registered are heard in front of the TTAB (or possibly in court too). These proceedings consist of: (1) cancellation of marks registered on the Principal or Supplemental Registers; (2) opposition to applications for registration on the Principal Register; (3) Concurrent use proceedings; or (4) interferences declared by the Commissioner of the USPTO.
