US PATENT SUBCLASS 392 / 497
.~ Immersion heater details

Current as of: June, 1999
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392 /   HD   ELECTRIC RESISTANCE HEATING DEVICES

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
497.~ Immersion heater details {6}
498  DF  .~.~> With thermostatic control means
499  DF  .~.~> Buoyant in liquid
500  DF  .~.~> With plural heating elements
501  DF  .~.~> With particular mounting means
502  DF  .~.~> Having positive temperature coefficient
503  DF  .~.~> Particular sheath or jacket composition

DEFINITION

Classification: 392/497

Immersion heater details:

(under subclass 200) Subject matter under Class 219, ... including details of an electrical resistance heating element which is supported within liquid to be heated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

301+, for borehole type.

357+, for fluid heat absorber.

377+, for heat exchange fluid.

398, for internal heating element.

401, for line connected closed tank.

447+, for internally positioned heating element. 451+, for immersion heating element.

471, for liquid heater with pump unit.

473+, for fluid heater carried on discharge member.

485+, for heated line section with heating element internal of flow path.

SEE OR SEARCH CLASS

99, Foods and Beverages: Apparatus,

279+, for infusers and subclasses 401+ for heat distributor, baffle or enclosure.

119, Animal Husbandry,

73, for a temperature-controlled watering device, subclass 229 for a fish enclosure with a heat exchanger and subclass 262 for an aquarium with a heat exchanger.