Subchapter I. The Principal Register 15 U.S. Code §1051. Application for registration; verification 15 U.S. Code §1052. Trademarks registrable on principal register; concurrent registration 15 U.S. Code §1053. Service marks registrable 15 U.S. Code §1054. Collective marks and certification marks registrable 15 U.S. Code §1055. Use by related companies affecting validity and registration 15 U.S. Code §1056. Disclaimer of unregistrable matter 15 U.S. Code §1057. Certificates of registration 15 U.S. Code §1058. Duration, affidavits and fees 15 U.S. Code §1059. Renewal of registration 15 U.S. Code §1060. Assignment 15 U.S. Code §1061. Execution of acknowledgments and verifications 15 U.S. Code §1062. Publication 15 U.S. Code §1063. Opposition to registration 15 U.S. Code §1064. Cancellation of registration 15 U.S. Code §1065. Incontestability of right to use mark under certain conditions 15 U.S. Code §1066. Interference; declaration by Director 15 U.S. Code §1067. Interference, opposition, and proceedings for concurrent use registration or for cancellation; notice; Trademark Trial and Appeal Board 15 U.S. Code §1068. Action of Director in interference, opposition, and proceedings for concurrent use registration or for cancellation 15 U.S. Code §1069. Application of equitable principles in inter partes proceedings 15 U.S. Code §1070. Appeals to Trademark Trial and Appeal Board from decisions of examiners 15 U.S. Code §1071. Appeal to courts 15 U.S. Code §1072. Registration as constructive notice of claim of ownership