(under subclass 29.02) Subject matter including a device which changes its optical property in response to radiant energy.
SEE OR SEARCH THIS CLASS, SUBCLASS:
54.13, for determining viscosity by measuring a time interval of travel or flow rate using an orifice, nozzle, or extrusion means wherein there is disclosed detail of a means whose optical character changes due to a change in a physical phenomenon associated with the liquid whose viscosity is being measured.
866.5, for a sensor means, per se.
SEE OR SEARCH CLASS
250, Radiant Energy, appropriate subclasses for a photocell detector, per se,
564+, for circuits for evaluating a liquid by means of measuring invisible light which has been modified as a result of the irradiation of the liquid thereby and subclasses 573+ for an optical or pre-optical system having a liquid in the path thereof wherein the modification of or the emission of radiant energy resulting from the irradiation of the liquid is tested. 356, Optics: Measuring and Testing,
438+, for an apparatus or a process for determining the moisture content of a gas by measuring visible light transmission or absorption and involving no other manipulation other than that necessary for an optical test for Class 356.
359, Optics: Systems (Including Communication) and Element, appropriate subclass, for an detector, per se.
