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title 37
Patents, Trademarks, and Copyrights
chapter I
CHAPTER I—UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE
part 1
PART 1—RULES OF PRACTICE IN PATENT CASES
subpart B
Subpart B—National Processing Provisions
subjgrp 98
Miscellaneous Provisions
Subjgrp 98. Miscellaneous Provisions
§ 1.248 - Service of papers; manner of service; proof of service in cases other than interferences and trials.
§ 1.251 - Unlocatable file.