Measuring and testing – Hardness – By penetrator or indentor
Reexamination Certificate
2007-07-19
2009-08-04
Williams, Hezron (Department: 2856)
Measuring and testing
Hardness
By penetrator or indentor
Reexamination Certificate
active
07568381
ABSTRACT:
The present invention provides an apparatus and method for performing surface property measurements, such as workpiece hardness and other material property measurements, with in-process compensation for instrument frame distortion and the like. The apparatus includes a substantially rigid base; a stylus coupled to the substantially rigid base, the stylus configured and selectively positioned to interact with a surface of a specimen at points along a central axis of the stylus; a proximity detector sensor coupled to the substantially rigid base, the proximity detector sensor disposed at a predetermined distance from the surface of the specimen and operable for sensing the predetermined distance between the proximity detector sensor and the surface of the specimen; and a proximity detector actuator coupled to the substantially rigid base, the proximity detector actuator operable for maintaining the predetermined distance between the proximity detector sensor and the surface of the specimen as the substantially rigid base and the stylus are moved with respect to the surface of the specimen along the central axis of the stylus.
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Ellis Jonathan D.
Smith Stuart T.
Bernard Christopher L.
Clements Bernard PLLC
Gissel Gunnar J
University of North Carolina at Charlotte
Williams Hezron
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