US PATENT SUBCLASS 356 / 128
REFRACTION TESTING (E.G., REFRACTOMETERS)

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

128REFRACTION TESTING (E.G., REFRACTOMETERS) {5}
129  DF  .~> Schlieren effect
130  DF  .~> Differential {1}
133  DF  .~> Refractive rod engages specimen
134  DF  .~> Prism forming fluid specimen container
135  DF  .~> Prism engaging specimen {2}

DEFINITION

Classification: 356/128

(under the class definition) Subject matter for testing the refraction of a fluid or solid wherein there is generally means to contain the fluid or support the solid statically or in motion; generally means, which may include a light source and which may be monochromatic light, to cause a diffused or a collimated beam of light to be transmitted through the fluid or solid under test or to be transmitted and reflected

internally from the surface of an optically transmissive member contiguous to the fluid or solid under test; and a visual or photoelectric device to note or measure the intensity of the light transmitted through the fluid or solid or the change in angle, direction, or the displacement of the light traversing the fluid or solid as a result of the light being refracted by the fluid or solid tested.

(1) Note. Comparison tests are included under this and the indented subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

124, for the testing of optical elements such as lenses and prisms, and particularly subclass 127 for prismatic and focal power tests which may include refraction testing.

345+, for interference tests which may involve the refraction of light.

357+, for interference tests for determining the thickness of films which may involve refraction test. SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

642+, for lenses, and subclasses 831+ for prisms and prism mounts.

364, Electrical Computers and Data Processing Systems, appropriate subclasses; see the search class note in References to Other Classes, in the class definition of this class (356).