US PATENT SUBCLASS 73 / 29.02
.~.~ Hygrometer

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

23.2  DF  GAS ANALYSIS {15}
29.01  DF  .~ Moisture content or vapor pressure {4}
29.02.~.~ Hygrometer {4}
335.01  DF  .~.~.~> With optical element
335.02  DF  .~.~.~> With electric circuitry or electric circuit component detail {1}
335.06  DF  .~.~.~> Wet and dry responsive elements {2}
335.11  DF  .~.~.~> Expanding-sorption element {3}

DEFINITION

Classification: 73/29.02

(under subclass 29.01) Subject matter wherein the amount of the liquid is the actual amount of water vapor in a unit volume of air (e.g., the absolute humidity) or the ratio of the amount of water vapor in the air to the amount of water vapor which the air would hold if it were saturated at that temperature (e.g., the relative humidity).

SEE OR SEARCH THIS CLASS, SUBCLASS:

29.01, for other thermal testing of a gas.

73+, for humidity determining means combined with additional apparatus for testing or determining the moisture content of a substance.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers, 61.06+, for humidity controlled electric switches.

236, Automatic Temperature and Humidity Regulation, principally

44, for humidity responsive devices combined with regulating means.

324, Electricity: Measuring and Testing, appropriate subclasses for devices wherein the atmosphere or gas changes in electrical conductance, in response to humidity and such property, is taken as a measure of humidity. Where no electrical property of the material under test is measured, but an additional element is exposed to the material to have its electrical properties affected by a physical property of the separate element measured, the art is in Class 73, Measuring and Testing.

338, Electrical Resistors,

35, for electrical resistors whose resistance value is responsive to humidity or changes in humidity.

361, Electricity: Electrical Systems and Devices,

178, for relays controlled by humidity.

374, Thermal Measuring and Testing,

109, for a measuring device providing a composite indication of temperature and humidity and subclass 142 for the combination of a thermometer and another measuring device wherein the thermometer is not a subcombination of a hygrometer. In the latter case when a thermometer is merely claimed as a subcombination of a hygrometer, the device would be classified in this class (73).