Office Action:

A letter from a trademark examining attorney setting forth the legal status of a trademark application. There are several types of Office actions: examiner’s amendments, priority actions, non-final Office actions, final Office actions, and suspension inquiry letters.

Official Gazette:

(eOG:T) - weekly publication of the USPTO that includes marks that have been published for opposition. The five most recent issues are available online.

Oppositions:

Proceeding before the Trademark Trial and Appeal Board in which the plaintiff seeks to prevent the issuance of a registration of a mark. An opposition is similar to a proceeding in a federal court, but is held before the Trademark Trial and Appeal Board, a USPTO administrative tribunal. Any person who believes that he or she will be damaged by the registration of a mark may file an opposition, but the opposition may only be filed in response to the publication of the mark in the Official Gazette.