US Patent: 2,091,995 - Hardness testing device


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US Patent: 2,091,995

Hardness testing device

Patentee:

Frederick Knoop (exact or similar names) - Washington, DC

USPTO Classifications:

15/160, 73/85

Tool Categories:

metalworking tools : machinist tools : measuring tools : metal hardness testers

Assignees:

The Government of the United States - Washington, DC

Manufacturer:

Wilson Mechanical Instrument Division, American Chain & Cable Co., Inc. - Bridgeport, CT

Witnesses:

Unknown

Patent Dates:
Applied:	Dec. 23, 1936
Granted:	Sep. 07, 1937

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for American Chain Co.

Description:

See patent 2,722,853 for an improvement to this patent. A 1957 brochure for the Tukon Tester from the Wilson Instrument Division of the American Chain & Cable Co., Inc., mentions "The Knoop Indenter (U. S. Patent No. 201995 under which we hold license)..."