US Patent: 1,294,171 - Hardness-tester


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US Patent: 1,294,171

Hardness-tester

Patentees:

Hugh M. Rockwell (exact or similar names) - Bristol, CT

Stanley P. Rockwell (exact or similar names) - Bristol, CT

USPTO Classifications:

73/81, 74/584

Tool Categories:

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

Assignees:

None

Manufacturer:

Wilson-Maeulen Co. - New York, NY

Witnesses:

William E. Wightman

Harold A. Kingsbury

Patent Dates:
Applied:	Jul. 15, 1914
Granted:	Feb. 11, 1919

Patent Pictures:

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Article on the development of hardness testing

Description:

This is the original patent for the Rockwell hardness tester which is used to test the hardness of various materials, especially metals. Co-inventor Stanley Rockwell would work with Charles H. Wilson of instrument-making firm Wilson-Maeulen Co. to further refine and commercialize this invention. Stanley Rockwell would win a lifetime achievement award from ASM International (formerly the American Society for Metals).

Based on previous patents, it appears that co-inventor Hugh M. Rockwell (who apparently was not related to Stanley P. Rockwell) had worked for New Departure Bearing Co., and for Standard Steel & Bearings, Inc.