The text and illustrations of US patents are in the public domain in the United States unless the patent text contains a specific notice that portions are copyrighted.
[1][2][3]
The original patent contains no such notice, so its contents are in the public domain in the United States.
PD-USPublic domain in the United States//en.wikipedia.org/wiki/Template:PD-US-patent-no_notice
The text and illustrations of US patents are in the public domain in the United States unless the patent text contains a specific notice that portions are copyrighted.
[1][2][3]
The original patent contains no such notice, so its contents are in the public domain in the United States.
PD-USPublic domain in the United States//en.wikipedia.org/wiki/Template:PD-US-patent-no_notice