US PATENT SUBCLASS 356 / 349
.~ With light beams of different frequency (e.g., heterodyning)

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

345  DF  BY LIGHT INTERFERENCE (E.G., INTERFEROMETERS) {11}
349.~ With light beams of different frequency (e.g., heterodyning) {1}
350  DF  .~.~> For rotation rate (e.g., ring laser)

DEFINITION

Classification: 356/349

With light beams of different frequency (e.g., heterodyning):

(under subclass 345) Subject matter wherein light beams of different frequency are mixed together in the formation of an interference pattern.

SEE OR SEARCH CLASS

73, Measuring and Testing, for vibration testing.