37 CFR 1.11
37 CFR 1.11 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.