Hair styling appliance heater and control
US5354967A · kind A · utility
24Cited by
22References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1992 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Nov 13, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A low cost heater element is disclosed which is formed of a wire wound mica paper substrate and a mica paper cover and a low cost diode acting as a negative temperature coefficient of resistance NTC temperature sensor. A control circuit provides power to the heater element in proportion to the line voltage. As a result, a light weight, low cost heater element is employed for various line voltages available throughout the world. The system employs digital logic to achieve temperature sensing, power sensing and indication that the system is on and operating at the correct temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.