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US Patent: 4,270,275
David Roberts McMurtry - Bristol, England

USPTO Classifications:
33/559, 33/561

Tool Categories:

Rolls-Royce Ltd. - London, England

Renishaw plc - Wotton-under-Edge, Gloucestershire, England


Patent Dates:
Granted: Jun. 02, 1981

Patent Pictures:
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Wikipedia page for Renishaw plc
This is the US equivalent of the original British patent GB-1,445,977 and {"A probe for determining at what point in space contact is made between an object and a stylus. The stylus is located in an accurately defined rest position relative to a housing and slight deflection of the stylus away from this rest position is detected preferably by electrical switches."

This patent covers a key innovation that enabled easier and more accurate CNC machining. McMurtry's invention led to the create of Renishaw plc, a specialist in CNC measurement devices with other product lines related to metrology and spectroscopy.

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