(under subclass 429) Subject matter wherein the web or thread is tested for flaws or imperfections.
(1) Note. The test for flaws or imperfections is usually manifested by a local variation in an optical characteristic of the material which stands out in contrast with the general or normal optical characteristics. This test is in contrast with the testing for the general reflecting or transmission properties of the web, and which is provided for in the generic subclass 429.
SEE OR SEARCH THIS CLASS, SUBCLASS:
238, for cloth inspection for flaws where the cloth is stationary.
SEE OR SEARCH CLASS
250, Radiant Energy,
548, and 559.01+ for web, strand, or records in the optical path where the light responsive element is not combined with an indicator; and subclass 237 for diaphragms, masks, or gratings combined with a photocell. 359, Optics: Systems (Including Communication) and Elements,
894+, for a light mask, per se, where there is not intentional deviation of the light as by refraction or diffraction.
