US PATENT SUBCLASS 356 / 360
.~.~ With two light beams (e.g., Twyman-Green)

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

345  DF  BY LIGHT INTERFERENCE (E.G., INTERFEROMETERS) {11}
359  DF  .~ For optical configuration {1}
360.~.~ With two light beams (e.g., Twyman-Green)

DEFINITION

Classification: 356/360

With two light beams (e.g., Twyman-Green):

(under subclass 359) Subject matter including a reference beam in addition to the object beam.

(1) Note. Twyman-Green interferometers are classified here.