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United States Patent Office
UMG22A23_015

United States Patent Office

Patent Office exterior, [Washington, D.C.] ca. between 1910 and 1935
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Patent Office exterior, [Washington, D.C.] ca. be...

Stacks of documents in Patent Office, Washington, D.C. ca. 1909
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Stacks of documents in Patent Office, Washington, ...

Workers at the U.S. Patent Office, [Washington, D.C.] ca. between 1918 and 1928
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Workers at the U.S. Patent Office, [Washington, D....

United States Patent office workers looking through collection of over 2,000,000 patents circa 1940 .
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United States Patent office workers looking throug...

Employees in the patent office file room circa 1940.
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Employees in the patent office file room circa 194...

Patent Office employee pointing to copies of first patent granted after 1836 when patent laws were rewritten circa 1940.
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Patent Office employee pointing to copies of first...