37 C.F.R. § 1.11 : Patents, Trademarks, and Copyrights — UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE — GENERAL — RULES OF PRACTICE IN PATENT CASES — GENERAL PROVISIONS —RECORDS AND FILES OF THE PATENT AND TRADEMARK OFFICE — Files open to the public

(a) The specification, drawings, and all papers relating to the file of: A published application; a patent; or a statutory invention registration are open to inspection by the public, and copies may be obtained upon the payment of the fee set forth in §1.19(b)(2). If an application was published in redacted form pursuant to §1.217, the complete file wrapper and contents of the patent application will not be available if: The requirements of paragraphs (d)(1), (d)(2), and (d)(3) of §1.217 have been met in the application; and the application is still pending. See §2.27 of this title for trademark files.
(b) All reissue applications, all applications in which the Office has accepted a request to open the complete application to inspection by the public, and related papers in the application file, are open to inspection by the public, and copies may be furnished upon paying the fee therefor. The filing of reissue applications, other than continued prosecution applications under §1.53(d) of reissue applications, will be announced in the Official Gazette. The announcement shall include at least the filing date, reissue application and original patent numbers, title, class and subclass, name of the inventor, name of the owner of record, name of the attorney or agent of record, and examining group to which the reissue application is assigned.
(c) All requests for reexamination for which all the requirements of §1.510 or §1.915 have been satisfied will be announced in the Official Gazette . Any reexaminations at the initiative of the Director pursuant to §1.520 will also be announced in the Official Gazette . The announcement shall include at least the date of the request, if any, the reexamination request control number or the Director initiated order control number, patent number, title, class and subclass, name of the inventor, name of the patent owner of record, and the examining group to which the reexamination is assigned.
(d) All papers or copies thereof relating to a reexamination proceeding which have been entered of record in the patent or reexamination file are open to inspection by the general public, and copies may be furnished upon paying the fee therefor.
(e) Except as prohibited in §41.6(b), §42.14 or §42.410(b), the file of any interference or trial before the Patent Trial and Appeal Board is open to public inspection and copies of the file may be obtained upon payment of the fee therefor.

37 C.F.R. §1.11

35 U.S.C. 6; 15 U.S.C. 1113, 1123

46 FR 29181, 5/29/1981, as amended at 47 FR 41272, 9/17/1982; 50 FR 9378, 3/7/1985; 60 FR 14518, 3/17/1995; 62 FR 53181, 10/10/1997; 65 FR 57051, 9/20/2000; 69 FR 49997, 8/12/2004; 70 FR 56126, 9/26/2005; 71 FR 44223, 8/4/2006; 77 FR 46624, 8/6/2012