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US Patent: 2,314,827
Process for extracting pure nitrogen from air
Patentee:
Richard M. Hortvet - Minneapolis, MN

USPTO Classifications:
137/625.3, 261/93, 422/189, 423/229, 423/351, 431/171, 431/8

Tool Categories:

Assignees:
Diamond Iron Works, Inc. - Minneapolis, MN

Manufacturer:
Diamond Iron Works - Minneapolis, MN

Witnesses:
Unknown

Patent Dates:
Applied: Feb. 27, 1939
Granted: Mar. 23, 1943

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Diamond Iron Works
Description:
The assignee also made sawmill machinery.

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