US PATENT SUBCLASS 356 / 35
.~.~ Sheet material


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

32  DF  MATERIAL STRAIN ANALYSIS {2}
33  DF  .~ With polarized light {2}
35.~.~ Sheet material


DEFINITION

Classification: 356/35

(under subclass 33) Subject matter wherein there is means to support transparent sheet material, statically or in motion, which exhibits birefringent properties naturally or when under strain, means to direct polarized light through the sheet material, and generally polarized light analyzing means to examine the sheet material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

429+, for monitoring of webs for optical properties or flaws.