US PATENT SUBCLASS 356 / 136
.~.~ Internally reflecting prism

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

128  DF  REFRACTION TESTING (E.G., REFRACTOMETERS) {5}
135  DF  .~ Prism engaging specimen {2}
136.~.~ Internally reflecting prism

DEFINITION

Classification: 356/136

(under subclass 135) Subject matter wherein the visible light used in the test is transmitted through and reflected internally of the prism at its surface forming the interface with the medium tested, and is then passed to the detecting and indicating means.