US PATENT SUBCLASS 219 / 236
.~.~.~.~ Coil or loop-type heating element

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
221  DF  .~ Tool or instrument {2}
227  DF  .~.~ Hand-manipulative {4}
229  DF  .~.~.~ With heated tip or other heat concentration means (i.e., heat applied to localized area) {5}
236.~.~.~.~ Coil or loop-type heating element {2}
237  DF  .~.~.~.~.~> Integral with tip
238  DF  .~.~.~.~.~> Detachable tip {1}

DEFINITION

Classification: 219/236

(under subclass 229) Subject matter wherein the electrical heater of the hand held tool or instrument comprises a coiled or looped wire resistance heater.

(1) Note. Included in this subclass are plural heating elements forming a heating unit which includes a switching arrangement to control the current to the heating unit or heating elements of diverse resistance characteristics and which automatically controls the current through the heating elements.

(2) Note. Included herein is the subcombination of a hand held electrically heated tool or instrument which includes the heating unit and the tip but not the heating unit, per se, or the tip, per se.

SEE OR SEARCH THIS CLASS, SUBCLASS:

222+, for hair treating, heating or curling instruments which are hand manipulatable and which utilize coil or loop type heating means in a similar manner.

254+, for sole plate pressure application means which may use coil or loop type heating means. 520+, for significant housing casing or support means, particularly subclass 530 for a heating unit which includes heat storage or transfer means.

538+, for significant heating unit structure, particularly subclass 540 which includes heat storage or transfer means.

552+, for heating elements, per se.

SEE OR SEARCH CLASS

338, Electrical Resistors, appropriate subclasses for a resistor which is not stated as being an electrical heater.