[Code of Federal Regulations] [Title 37, Volume 1] [Revised as of July 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 37CFR1.34] [Page 41-42] TITLE 37--PATENTS, TRADEMARKS, AND COPYRIGHTS CHAPTER I--UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE PART 1_RULES OF PRACTICE IN PATENT CASES--Table of Contents Subpart B_National Processing Provisions Sec. 1.34 Acting in a representative capacity. When a patent practitioner acting in a representative capacity appears in person or signs a paper in practice before the United States Patent and Trademark Office in a patent case, his [[Page 42]] or her personal appearance or signature shall constitute a representation to the United States Patent and Trademark Office that under the provisions of this subchapter and the law, he or she is authorized to represent the particular party on whose behalf he or she acts. In filing such a paper, the patent practitioner must set forth his or her registration number, his or her name and signature. Further proof of authority to act in a representative capacity may be required. [70 FR 56127, Sept. 26, 2005]