Electric Heating Patents (Class 219)
- With diverse device (Class 219/679)
- With diverse-type heating (Class 219/680)
- Gas environment (e.g., pressurized, etc.) (Class 219/686)
- Fluid heater (Class 219/687)
- Waveguide applicator (Class 219/690)
- Tunnel furnace (Class 219/698)
- With control system (Class 219/702)
- Cookware (e.g., vessel, utensil, etc.) (Class 219/725)
- Radiation protection (Class 219/736)
- Field modification (Class 219/745)
- Enclosed cavity structure (Class 219/756)
- With heat exchange (e.g., susceptor, etc.) (Class 219/759)
- With specific transformer (Class 219/760)
- With specific generator (Class 219/761)
- Load support (Class 219/762)
- Chain (Class 219/51)
- Rail bond (Class 219/53)
- Wire, rod, or bar bonding (Class 219/56)
- Of cylinders (e.g., pipes and tubes) (Class 219/59.1)
- Cutting or disintegrating (e.g., machining engraving) (Class 219/68)
- Liquid electrode (Class 219/71)
- Nonatmospheric environment at hot spot (e.g., resistance weld under oil, vacuum) (Class 219/72)
- For deposition welding (e.g., coating or building up) (Class 219/76.1)
- For bonding with pressure (e.g., resistance welding) (Class 219/78.01)
- By arc (Class 219/121.11)
- Weld rod structure (Class 219/145.1)
- Weld rod composition (Class 219/146.1)
- Bonding (Class 219/148)
- With forging or shaping (e.g., of powder) (Class 219/149)
- Endless strip (Class 219/155)
- Rods and bars (Class 219/156)
- Rivets (Class 219/157)
- Work holders (Class 219/158)
- Methods (Class 219/162)
- Combined with diverse-type art device (Class 219/201)
- Tool or instrument (Class 219/221)
- Combined with pressure application means (Class 219/243)
- Resistive element: igniter type (Class 219/260)
- Electric arc-type devices (Class 219/383)
- Combined with container, enclosure, or support for material to be heated (Class 219/385)
- Plural functions simultaneously or convertible (Class 219/472)
- With plural heat utilization means (single heater) (Class 219/475)
- Plural separate heating devices (Class 219/476)
- With protective means for heater (Class 219/481)
- With power supply and voltage or current regulation or current control means (Class 219/482)
- With current connection and/or disconnection means (e.g., switch) (Class 219/507)
- With heater-unit housing, casing, or support means (e.g., frame and single sheet) (Class 219/520)
- With heating unit structure (Class 219/538)
