US PATENT SUBCLASS 356 / 381
.~ Of thickness

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

372  DF  BY MENSURATION {8}
381.~ Of thickness {1}
382  DF  .~.~> Of light permeable material

DEFINITION

Classification: 356/381

Of thickness:

(under subclass 372) Subject matter including means for measuring between opposite surfaces or depth or in a direction perpendicular to the length and breadth of an object.

SEE OR SEARCH THIS CLASS, SUBCLASS:

355+, and 357+, for light interference thickness measurement.