The grounds for opposition can be as broad as "any person who believes that [they] would be damaged by the registration of a mark." Despite this broad language, it is also true that the opposer must have a personal interest in the outcome beyond that of the general public, and generally involved with the goods or services that may be described by the alleged mark. Oppositions are most commonly filed when a mark is (1) likely to confuse consumers with respect to an existing mark, (2) descriptive, (3) generic, (4) misdescriptive, (5) deceptive, or (6) registered under fraud.
