| 1/00 | Details of electric heating devices |
| 1/02 | Details of electric heating devices Automatic switching arrangements specially adapted to heating apparatus (thermally-actuated switches H01H 37/00
) |
| 3/00 | Ohmic-resistance heating |
| 3/02 | Ohmic-resistance heating Details |
| 3/03 | Ohmic-resistance heating Details Electrodes |
| 3/04 | Ohmic-resistance heating Details Waterproof or air-tight seals for heaters |
| 3/06 | Ohmic-resistance heating Details Heater elements structurally combined with coupling elements or with holders |
| 3/08 | Ohmic-resistance heating Details Heater elements structurally combined with coupling elements or with holders having electric connections specially adapted for high temperatures |
| 3/10 | Ohmic-resistance heating Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor (compositions per se, see the relevant subclasses) |
| 3/12 | Ohmic-resistance heating Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor (compositions per se, see the relevant subclasses) characterised by the composition or nature of the conductive material |
| 3/14 | Ohmic-resistance heating Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor (compositions per se, see the relevant subclasses) characterised by the composition or nature of the conductive material the material being non-metallic |
| 3/16 | Ohmic-resistance heating Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor (compositions per se, see the relevant subclasses) the conductor being mounted on an insulating base |
| 3/18 | Ohmic-resistance heating Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor (compositions per se, see the relevant subclasses) the conductor being embedded in an insulating material |
| 3/20 | Ohmic-resistance heating Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater (H05B 3/62, H05B 3/68, H05B 3/78, H05B 3/84 take precedence) |
| 3/22 | Ohmic-resistance heating Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater (H05B 3/62, H05B 3/68, H05B 3/78, H05B 3/84 take precedence) non-flexible |
| 3/24 | Ohmic-resistance heating Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater (H05B 3/62, H05B 3/68, H05B 3/78, H05B 3/84 take precedence) non-flexible heating conductor being self-supporting |
| 3/26 | Ohmic-resistance heating Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater (H05B 3/62, H05B 3/68, H05B 3/78, H05B 3/84 take precedence) non-flexible heating conductor mounted on insulating base |
| 3/28 | Ohmic-resistance heating Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater (H05B 3/62, H05B 3/68, H05B 3/78, H05B 3/84 take precedence) non-flexible heating conductor embedded in insulating material |
| 3/30 | Ohmic-resistance heating Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater (H05B 3/62, H05B 3/68, H05B 3/78, H05B 3/84 take precedence) non-flexible heating conductor embedded in insulating material on or between metallic plates |
| 3/32 | Ohmic-resistance heating Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater (H05B 3/62, H05B 3/68, H05B 3/78, H05B 3/84 take precedence) non-flexible heating conductor mounted on insulators on a metallic frame |