US PATENT SUBCLASS 436 / 151
.~ By means of a solid body in contact with a fluid

Current as of: June, 1999
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436 /   HD   CHEMISTRY: ANALYTICAL AND IMMUNOLOGICAL TESTING

149  DF  MEASUREMENT OF ELECTRICAL OR MAGNETIC PROPERTY OR THERMAL CONDUCTIVITY {3}
151.~ By means of a solid body in contact with a fluid {1}
152  DF  .~.~> Solid body contains a combustion catalyst

DEFINITION

Classification: 436/151

By means of a solid body in contact with a fluid:

(under subclass 149) Subject matter wherein the changes in an electric or magnetic property of a solid in physical contact with the fluid to be determined provides the basis for analysis.

(1) Note. Physical contact includes chemical reaction with a material as well as mere adsorption.

(2) Note. Solid body includes a confined mass of particles whose electric or magnetic properties are determined as well as a structural device.

(3) Note. Thermal conductivity measurement is classified in 149 since the measurement is not based on chemical reaction or absorption with the solid but upon the cooling effect of the fluid on the solid element.

SEE OR SEARCH CLASS

73, Measuring and Testing,

19.01+, and 23.2+ for physical methods of gas analysis, especially subclasses 23.35+ for chromatos:graphic analysis.

204, Chemistry: Electrical and Wave Energy, appropriate subclasses for electrical or wave energy processes and apparatus. See section III of the Class 204 definition for an explanation of the class line between Class 436 and Class 204. 205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions,

775+, for electrolytic analysis or testing processes.

340, Communications: Electrical,

632+, for electrical indicating or measuring systems which include the use of a semiconductor gas detector.