Manual of U.S. Patent Classification
as of June 30, 2000

Class
219
ELECTRIC HEATING

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

Patents classified in a subclass may be accessed by clicking on the " " icon following the subclass number, below.

( please note that links to definitions and classified patents may not be available for some classes and subclasses )

For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> ELECTRIC HEATING
600		INDUCTIVE HEATING
601		. With diverse-type heating
602		. Metal working
603		. . Bonding
604		. . . Container sealing
605		. . . Wire (e.g., cable, etc.)
606		. . . Ring
607		. . . Tube (i.e., pipe)
608		. . . . With electrical control (e.g., speed, temperature, gaging thickness, etc.)
609		. . . . Layering (e.g., coating, lining, etc.)
610		. . . . With preheating or postheating
611		. . . . Plural (e.g., end to end, etc.)
612		. . . . Seam bonding
613		. . . . . With impeder
614		. . . . . With guiding device
615		. . . Brazing (e.g., cladding, etc.)
616		. . . Soldering
617		. . . Welding
618		. With heat exchange
619		. . Roller (e.g., godet, etc.)
620		. . Cooking
621		. . . Utensil (e.g., pot, pan, etc.)
622		. . . With support
623		. . . . Having cooling device
624		. . . Core or coil structure
625		. . . Intermediate member condition responsive
626		. . . . Load sensing
627		. . . . Temperature
628		. . Fluid or liquid heater
629		. . . By tube (i.e., pipe)
630		. . . . Core or coil structure
631		. . . . . Core rotation
632		. . With cooling arrangement
633		. . Bonding (e.g., nonmetallic, etc.)
634		. . Susceptor
635		. Specific heating application
636		. . Wire (e.g., cable, etc.)
637		. . Rod
638		. . . Semiconductor
639		. . . Irregular (e.g., camshaft, etc.)
640		. . Gear
641		. . Valve
642		. . Ring or link
643		. . Tube (i.e., pipe)
644		. . . Interior surface
645		. . Strip (e.g., sheet, etc.)
646		. . Slab (e.g., ingot, etc.)
647		. With workpiece support
648		. . Levitation
649		. . Materials
650		. . With monitoring (e.g., regulating, etc.)
651		. . Gas environment
652		. . Rotation of workpiece
653		. . Conveyor
654		. . . Charge or discharge
655		. . . Multiple stations
656		. . . . Plural heating zones
657		. . . Curve path
658		. . . Lift (i.e., vertical movement)
659		. . Pressure applicator (e.g., clamp, etc.)
660		. With power supply system
661		. . Power switching
662		. . . Plural load inductors
663		. . . Condition responsive
664		. . . . Input monitoring
665		. . . . Load sensing
666		. . . . . With tuning
667		. . . . . Temperature
668		. . . With protection
669		. . . Polyphase
670		. . With specific transformer
671		. . With plural load inductors
672		. Specific inductor configuration
673		. . U-coil section
674		. . Cylindrical coil
675		. . Planar coil
676		. . With inductor support
677		. . With cooling arrangement
678		MICROWAVE HEATING
679		. With diverse device
680		. With diverse-type heating
681		. . Convection heating
682		. . . Steam generating
683		. . . Gas burner
684		. . . Tunnel type
685		. . Resistive heating
686		. Gas environment (e.g., pressurized, etc.)
687		. Fluid heater
688		. . Water
689		. . Beverage (e.g., coffee, etc.)
690		. Waveguide applicator
691		. . Slotted
692		. . . Meander (e.g., zigzag, etc.)
693		. . . Having load passage
694		. . With dummy load
695		. . Input power port arrangement
696		. . . With tuning
697		. . . Plural feed
698		. Tunnel furnace
699		. . With leakage suppression
700		. . Conveyor
701		. . . Plural heating zones
702		. With control system
703		. . Defrost
704		. . Load condition sensor
705		. . . Plural diverse types
706		. . . By ultrasonic or acoustic
707		. . . Gas or vapor
708		. . . Weight
709		. . . Field intensity/reflection
710		. . . Temperature
711		. . . . By infrared
712		. . . . Probe
713		. . . . . Wireless type
714		. . Remote (e.g., card, etc.)
715		. . Power switching
716		. . . With detector
717		. . . Plural power supplies
718		. . . Having duty cycle
719		. . With timer
720		. . With display or alarm
721		. . Starting circuitry
722		. . Interlock circuitry and structure
723		. . . With additional safety feature
724		. . . With latch assembly
725		. Cookware (e.g., vessel, utensil, etc.)
726		. . With food mixer
727		. . Expandable
728		. . With field modifier
729		. . . Shielding
730		. . With heat exchange (e.g., susceptor, etc.)
731		. . . By fluent material (e.g., steaming, boiling, or frying, etc.)
732		. . With stand or handle
733		. . With drainage
734		. . With cover
735		. . . Having vent
736		. Radiation protection
737		. . With leakage detector
738		. . With leakage prevention
739		. . . Door assembly
740		. . . . With screen or window
741		. . . . With choke or seal
742		. . . . . Slotted choke
743		. . . . . Choke cavity cover
744		. . . Absorption
745		. Field modification
746		. . With power feed structure
747		. . . Phase shifting
748		. . . Radiator (e.g., antenna, etc.)
749		. . . . Rotating
750		. . . With tuning or particular modes
751		. . Mixer (e.g., rotating stirrer, etc.)
752		. . By load support movement
753		. . . Horizontal and vertical
754		. . . Horizontal (e.g., turntable, etc.)
755		. . . . Portable
756		. Enclosed cavity structure
757		. . With cooling or ventilation
758		. . With cavity illumination
759		. With heat exchange (e.g., susceptor, etc.)
760		. With specific transformer
761		. With specific generator
762		. Load support
763		. . Shelf
764		CAPACITIVE DIELECTRIC HEATING
765		. Bonding
766		. . Shoe
767		. . Die embroidery
768		. . Sewing machine type
769		. . Container sealing
770		. Specific heating application
771		. . Food
772		. . Fluent material
773		. . Sheet (e.g., board, etc.)
774		. With workpiece support
775		. . Conveyor
776		. . . Multiple stations
777		. . Pressure applicator (e.g., clamp, etc.)
778		. With power supply system
779		. . Condition responsive
780		. Specific electrode configuration
50		METAL HEATING (E.G., RESISTANCE HEATING)
51		. Chain
52		. . Methods
53		. Rail bond
54		. . Arc weld
55		. . Resistance weld methods
56		. Wire, rod, or bar bonding
56.1		. . Of wire leads
56.21		. . . By microbonding
56.22		. . . Methods
57		. . Butt bonding (e.g., welding)
58		. . Methods
59.1		. Of cylinders (e.g., pipes and tubes)
60R		. . Electric arc
60.2		. . . Tube sheet welding
61		. . . Methods
60A		. . . Rotatable tube welders
61.1		. . Having internal support means
61.11		. . . With forming means
61.12		. . . With cleaning means
61.13		. . . With edge guidance means
61.2		. . Utilizing high frequency resistance heating
61.3		. . With edge guidance means
61.4		. . With adjustable electrode means
61.5		. . With condition responsive control of the welding process
61.6		. . Using three or more electrodes
61.7		. . With cooling means
62		. . Helical seam
63		. . Rotary transformer part
64		. . Container (e.g., cans)
65		. . Nonrotary electrode (e.g., oscillating)
66		. . Inside electrode
67		. . Resistance heating methods
68		. Cutting or disintegrating (e.g., machining engraving)
69.1		. . Electric arc
69.11		. . Electric spark machining
69.12		. . . Wire cutting
69.13		. . . Circuits
69.14		. . . Dielectric composition and purification
69.15		. . . Electrodes
69.16		. . . Gap spacing control
69.17		. . . Methods
69.18		. . . Pulse
69.19		. . . Safety circuits
69.2		. . . Vibrating electrodes or workpiece
70		. . . Hand-type tools
71		. Liquid electrode
72		. Nonatmospheric environment at hot spot (e.g., resistance weld under oil, vacuum)
73		. . Slag (e.g., submerged arc)
73.1		. . . Including electroslag welding
73.11		. . . . For coating
73.2		. . . With granular flux supply
73.21		. . . . For deposition welding
74		. . Gas supply (e.g., by ingredient of electrode, by external source)
75		. . . Nonconsumable electrode (e.g., atomic hydrogen)
76.1		. For deposition welding (e.g., coating or building up)
76.11		. . With cooling means
76.12		. . Of multiple distinct layers
76.13		. . By spark discharge
76.14		. . By electric arc
76.15		. . . With nonconsumable electrode
76.16		. . . Plasma
76.17		. . By resistance heating
77		. . Cutting edges of tools
78.01		. For bonding with pressure (e.g., resistance welding)
85.1		. . Brazing or soldering
85.12		. . . Utilizing radiant energy
85.13		. . . . Methods
85.14		. . . With filler metal in circuit
85.15		. . . . Methods
85.16		. . . Electrically heated tool (e.g., electrodes, heaters, etc.)
85.17		. . . Furnaces or enclosures
85.18		. . . Wire lead bonders
85.19		. . . Machine for predetermined operation
85.2		. . . Fluxes or solders
85.21		. . . Solder preforms
85.22		. . . Methods
78.02		. . By solid-state bonding (e.g., diffusion)
78.11		. . Honeycomb
78.12		. . . Methods
78.13		. . With additional heating device
78.14		. . With work cleaning means
78.15		. . With work cutting means
78.16		. . With work deforming means (e.g., tube sealing)
79		. . With conveyer for workpiece
80		. . . Spot bond
81		. . Roller electrode
82		. . . Roller moves over work
83		. . . Methods
84		. . . Electrode structure
86.1		. . By spot bonding
86.21		. . . With hand-manipulative portable devices
86.22		. . . With separately applied pressure and heat
86.23		. . . With welding pressure controlled by the work support
86.24		. . . With work orientation means
86.25		. . . With significant electrode support
86.31		. . . . Having cooling means
86.32		. . . . Having magnetic force actuated electrode
86.33		. . . . Having adjustment means
86.41		. . . . . With condition responsive control means
86.51		. . . . . . Responsive to pressure
86.61		. . . . . . . By force balancing
86.7		. . . . . For predetermined welding operation
86.8		. . . . Having interchangeable welding electrodes
86.9		. . . For one-face welding
87		. . . Multiple spot type
88		. . . Electrode positionable along fixed bus bar (e.g., reaction bar type)
89		. . . Fluid pressure actuated electrode
90		. . . Plier or tong type
91.1		. . . With condition responsive control of the welding process
91.2		. . . Methods
91.21		. . . . Of welding through insulation
91.22		. . . . With additional heating to same spot
91.23		. . . . With work deforming
92		. . . . Current limitation (e.g., by interposed insulation)
93		. . . . . By localized projection
94		. . . . . By interposed button
95		. . Percussive
96		. . . Methods
97		. . Flash
98		. . . Stud
99		. . . . Methods
100		. . . Methods
101		. . Butt
102		. . . Extended seam
103		. . . One part fed
104		. . . Methods
105		. . . . Preparation of edges
106		. . . . By use of a bridging member (e.g., splice plate)
107		. . . . End or edge to surface
108		. . Systems of current supply
109		. . . With indicator (e.g., recorder)
110		. . . Controlled in response to current, voltage, or temperature
111		. . . Repeat or interrupted current systems (e.g., multiple welds, multiple heated weld)
112		. . . Stored energy discharge (e.g., inductive)
113		. . . . Condenser discharge
114		. . . With space-discharge tube control (e.g., thyratron, ignitron)
115		. . . Synchronous switching on and off
116		. . . With transformer
117.1		. . Methods
118		. . . Particular material (e.g., dissimilar, aluminum)
119		. . Electrodes (e.g., structure)
120		. . . With cooling
121.11		. By arc
121.12		. . Using electron beam
121.13		. . . Welding
121.14		. . . . Methods
121.15		. . . Deposition (e.g., sputtering)
121.16		. . . Melting
121.17		. . . . Methods
121.18		. . . Cutting
121.19		. . . . Etching or trimming
121.2		. . . . . Methods
121.21		. . . Chamber
121.22		. . . . Sealing
121.23		. . . . Monitoring
121.24		. . . Nonvacuum environment
121.25		. . . Shaping
121.26		. . . . With focusing
121.27		. . . . With electrode or gun structure
121.28		. . . Position control
121.29		. . . . Swept or scanned
121.3		. . . . Condition responsive
121.31		. . . Workpiece position control
121.32		. . . . Conditi