In all inter partes proceedings equitable principles of laches, estoppel, and acquiescence, where applicable may be considered and applied.
Structure US Code
SUBCHAPTER I— THE PRINCIPAL REGISTER
§ 1051. Application for registration; verification
§ 1052. Trademarks registrable on principal register; concurrent registration
§ 1053. Service marks registrable
§ 1054. Collective marks and certification marks registrable
§ 1055. Use by related companies affecting validity and registration
§ 1056. Disclaimer of unregistrable matter
§ 1057. Certificates of registration
§ 1058. Duration, affidavits and fees
§ 1059. Renewal of registration
§ 1061. Execution of acknowledgments and verifications
§ 1063. Opposition to registration
§ 1064. Cancellation of registration
§ 1065. Incontestability of right to use mark under certain conditions
§ 1066. Interference; declaration by Director
§ 1066b. Ex parte reexamination
§ 1069. Application of equitable principles in inter partes proceedings
§ 1070. Appeals to Trademark Trial and Appeal Board from decisions of examiners
§ 1072. Registration as constructive notice of claim of ownership