English: Figure in the US patent of Age hardenable chromium-nickel stainless steel (precipitation hardening stainless teel) by Ernest H. Wyche and Smith Raymond. https://patents.google.com/patent/US2381416A
The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)
The original patent contains no such notice, so its contents are in the public domain.
Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.