Image:Hill's message protector fig4 cropped.png

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Image:Hill's message protector fig4 cropped.png

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A cropped, cleaned up version of figure 4 from Hill's "Message Protector" patent, US patent 1,845,947 of 1929. Sourced from http://www.und.nodak.edu/org/crypto/crypto/.hill4.html where it was scanned in by the American Cryptogram Association. Securiger 08:24, 22 Nov 2004 (UTC)

In general, the contents of United States patents are in the public domain.[1]

In specific cases, patent applicants and holders may claim copyright in portions of those documents. In those specific cases, applicants are required to identify the portions that are protected under copyright, and are additionally required to state the following within the body of the application and patent:[2] [3]

A portion of the disclosure of this patent document contains material which is subject to (copyright or mask work) protection. The (copyright or mask work) owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all (copyright or mask work) rights whatsoever.

The original patent should be checked for the presence of such language before an assumption is made that the contents are in the public domain.

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	Date/Time	Dimensions	User	Comment
current	08:01, 22 November 2004	405×370 (11 KB)	Securiger (Talk \| contribs)	(A cropped, cleaned up version of figure 4 from Hill's "Message Protector" patent, US patent 1845947 of 1929)