(under subclass 381) Subject matter for measuring the thickness of light permeable material, the measuring operation depending upon the fact that the material is light permeable.
SEE OR SEARCH CLASS
65, Glass Manufacturing,
377+, and 159 for methods and apparatus for forming a glass product and the test of the glass product by optical means for thickness of the product.
209, Classifying, Separating, and Assorting Solids,
586, for radiant energy dimensioning of an article and sorting of an article based on the dimensional sensing, and subclass 588 wherein radiant energy transmitted through an article is sensed and sorting of an article is based on the sensed transmission.
250, Radiant Energy, 306+, for methods and apparatus which may measure the thickness of articles by charged particles; and subclasses 336.1+, especially subclasses 357.1+ and 358.1+ for methods and apparatus which may detect the thickness of solid or fluent material by an invisible radiant energy responsive electric signalling detector.
