(under subclass 200) Devices including significant structure whereby the heating unit or units of a heating device, are adapted to be connected to or disconnected from an external source of electrical energy.
(1) Note. For heating devices, such as are classified in this class, combined with means for controlling the level or amplitude of heating current or voltage between certain limits or for a certain interval of time the search should be in subclasses 482+ above, or in the particular subclass relating to specific type heating devices elsewhere in the class.
(2) Note. Heating devices directed to particular types of heaters set out elsewhere in the schedule and including significant circuit connection or disconnection means are listed under "Search This Class, Subclass" below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111, for resistance welding systems with repeat or interrupted current systems.
115, for resistance welders with means for synchronously switching the current on or off. 240+, for hand held heating tools with current switching means.
250+, for electric flatiron type devices with current control means.
256+, for electric flatiron type devices with current switching means.
262+, for resistive element igniters with switching means.
272, for vaporizer with external circuit switching means.
295, for liquid in circuit heaters with switching means.
308+, for forced circulation liquid heaters with switching means.
327+, for liquid heaters with current control means.
337, for liquid heaters with external circuit switching means.
356, for radiant type fluid heaters with external circuit switching means.
364, for convection type fluid heaters with external circuit switching means.
379, for fluid heater with external circuit switching means. 419, for deepwell heaters with external circuit switching means.
451+, for planar surface heaters with external circuit switching means.
482+, see (1) Note, above.
541, for heater unit structure with connector means.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems,
112+, for switching systems in general.
337, Electricity: Electrothermally or Thermally Actuated Switches, appropriate subclasses.
338, Electrical Resistors, for
215, for resistance devices, per se, combined with a switch.
361, Electricity: Electrical Systems and Devices, 139+, for control circuits for electromagnetic devices.
439, Electrical Connectors, appropriate subclass for electrical quid detachable connector structure.
