English: Illustration from 1881 US Patent 248872, for a perpetual calendar paperweight. The upper section is rotated to reveal one of seven lists of years (splitting leap years) for which the seven calendars below apply.
Source
Figure 1 from US Patent 248872, granted Nov 1, 1881 to Robert McCurdy for a perpetual calendar paperweight.
As one of the drawings submitted by McCurdy to the USPTO to substantiate his patent claims, it is public domain.
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Public domainPublic domainfalsefalse
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}}.
Figure 1 from US Patent 248872, granted Nov 1, 1881 to Robert McCurdy for a perpetual calendar paperweight.
As one of the drawings submitted by McCurdy to the USPTO to substantiate his patent claims, it is public domain.
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