(under the class definition) Subject matter including structure for determining the physical properties of liquid oil by the optical response, such as produced by visible light transmitted through or reflected from the oil.
(1) Note. The optical response may involve the examination of the oil for color, polarization effects, or for foreign content such as sediment in the oil. Both visual and photoelectric devices are here, and the test may be of oil samples or of oil moving in a closed system.
SEE OR SEARCH THIS CLASS, SUBCLASS:
51, for tests of oil which may involve infrared radiation.
128+, for refraction test devices which may be applicable for testing of oil.
364+, for polarization test devices which may be applicable for the testing of oil.
402+, for color test devices which may be applicable for the testing of oil. 432+, for transmission test devices particularly for comparison tests, and
441+, for liquid particle suspension tests.
445+, for reflection test devices which may be applicable to the testing of oil.
SEE OR SEARCH CLASS
73, Measuring and Testing,
28, for testing for solid matter entrained in a gas, subclasses 61.41+ for the testing of a liquid for sediment or foreign content where more than a visual or photoelectric test of the color or the amount of visible radiation transmitted through or scattered from the liquid is involved, and subclasses 53.05+ for lubricant testing, subclasses 152.18+ for a fluid analysis in testing a borehole, a casing, or a drill rigging wherein the test is not purely electrical or purely magnetic, in particular subclass 152.42 for determining the relative proportion of fluid constituents by a test which is not purely electrical or purely magnetic.
116, Signals and Indicators,
200+, for visual indicators, per se, where no color or other optical comparison test is involved and for level indicators of the mechanical type.
