Electric blanket safety circuit
US4436986A · kind A · utility
69Cited by
11References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1981 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | Nov 23, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A safety circuit for deenergizing an electric blanket of the type utilizing a positive coefficient resistance material as the heating element positioned between a pair of spaced conductor wires. The circuit includes one or more gas tubes with parallel resistances connected across the conductor wires to sense voltage changes caused by open or short circuits and to conduct sufficiently high currents to blow a series connected fuse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.