Electric Resistance Heating Devices Patents (Class 392)
- Borehole type (Class 392/301)
- Combined with nonelectric heating means (e.g., gas, etc.) (Class 392/307)
- Fluid-in-circuit type heater (Class 392/311)
- With heat storage means (Class 392/339)
- Convection space heater (Class 392/347)
- Concentrated heated air stream (i.e., blast) (Class 392/379)
- Vaporizer (Class 392/386)
- Radiant heater (Class 392/407)
- Tank or container type liquid heater (Class 392/441)
- Continuous flow type fluid heater (Class 392/465)
- Immersion heater details (Class 392/497)
