Stating that “a laches or estoppel defense in an opposition (or cancellation) proceeding may be based upon the Opposer's failure to object to an Applicant's registration of substantially the same mark ”
Holding that third-party evidence should not be disregarded in evaluating the strength of a mark for purposes of determining the likelihood of confusion
Stating that "[a]s to strength of a mark . . . [third-party] registration evidence may not be given any weight . . . [because they are] not evidence of what happens in the market place"