US PATENT SUBCLASS 340 / 632
.~.~.~ Gas

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
603  DF  .~.~ Fluent material {7}
632.~.~.~ Gas {2}
633  DF  .~.~.~.~> Catalytic detector
634  DF  .~.~.~.~> Semiconductor detector

DEFINITION

Classification: 340/632

Gas:

(under subclass 603) Subject matter wherein the fluent material is a gas.

SEE OR SEARCH CLASS

73, Measuring and Testing,

23.2+, for gas analysis.

200, Electricity: Circuit Makers and Breakers,

61.03, for a gas operated switch.

356, Optics: Measuring and Testing, 213+, and 300+ for spectroscopy and photometers respectively.