US PATENT SUBCLASS 431 / 76
.~.~ Combustion product composition sensor


Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
75  DF  .~ By combustion or combustion zone sensor {2}
76.~.~ Combustion product composition sensor


DEFINITION

Classification: 431/76

(under subclass 75) Apparatus in which the control is by a means analyzing the composition of or responding to the relative quantity of a material formed in the combustion area, e.g., carbon or CO[supscrpt]2[end supscrpt] in combustion gases, etc.

SEE OR SEARCH CLASS

73, Measuring and Testing,

23.2+, for apparatus for gas analysis.

200, Electricity: Circuit Makers and Breakers,

61.03, for a smoke responsive switch.

324, Electricity: Measuring and Testing, appropriate subclass for apparatus for testing the electrical properties of gases. 422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,

83+, for chemical gas analysis apparatus.