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U.S. Code
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TITLE 35 - PATENTS
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PART I—UNITED STATES PATENT...
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CHAPTER 2—PROCEEDINGS IN THE PATENT AND TRADEMA...
CHAPTER 2—PROCEEDINGS IN THE PATENT AND TRADEMARK OFFICE (§§ 21 – 27)
§ 21. Filing date and day for taking action
§ 22. Printing of papers filed
§ 23. Testimony in Patent and Trademark Office cases
§ 24. Subpoenas, witnesses
§ 25. Declaration in lieu of oath
§ 26. Effect of defective execution
§ 27. Revival of applications; reinstatement of reexamination proceedings