MEASUREMENT INCLUDES TEMPERATURE CHANGE OF THE MATERIAL BEINGANALYZED (E.G., CALORIMETRY, ETC.):
(under the class definition) Subject matter wherein
temperature changes occurring when a material to be analyzed is chemically reacted are utilized as the basis for qualitative or quantitative chemical analysis.
(1) Note. This subclass provides for processes of calorimetry wherein the heat of reaction of a material is used to qualitatively or quantitatively identify a material, mere determination of heat of formation of a known compound is provided for in Class 73, Measuring and Testing.
(2) Note. In general the calorimetry found in this Class 436 will involve the chemical combination of a chemical constituent with another to determine the amount or identity of one reactant.
(3) Note. Although burning a combustible material is technically a chemical reaction, it has not for purposes of classification been considered "chemical". Thus, a process of combustion followed by analysis of the results may be found in Classes 73, 250, 324, and 356 on the basis of the analysis technique.
(4) Note. The determination of amount of a chemical species is presumptively a chemical analysis in the absence of a showing that the materials are identified by physical tests alone.
(5) Note. This subclass does not provide for a process wherein the temperature sensor or a portion thereof reacts with the material to be analyzed, such as a process wherein the properties of a conductor or semiconductor are chemically altered in an analysis with a corresponding change in electrical properties.
SEE OR SEARCH THIS CLASS, SUBCLASS: 151+, for a process of chemical analysis utilizing a catalyst coated temperature responsive electric element and the search notes thereunder.
SEE OR SEARCH CLASS
73, Measuring and Testing,
25.01+, for a method of gas analysis by electrical thermal determination.
356, Optics: Measuring and Testing,
311+, for methods which include heating, burning or otherwise stimulating a sample to cause emission of radiation for optical analysis including burning, resistance heating, flame and high frequency fields.
374, Thermal Measuring and Testing,
31+, for processes for calorimetrically determining the
amount of a constituent in a compound or the heat of chemical combination where such process involve no more than a determination of the heat evolved by combustion of the material under test.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
51, for apparatus for carrying out the process of this subclass.
