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}}.
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{{Information |Description ={{en|1=diagram of a general DPCM encoder/decoder from Chape Cutler's U. S. patent 2605361}} |Source =[http://www.google.com/patents?id=F55NAAAAEBAJ U. S. patent 2605361] |Author =C. Chapin Cutler and his agen
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