Blanket wire utilizing positive temperature coefficient resistance heater
US4271350A · kind A · utility
40Cited by
10References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 19, 1980 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | May 19, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49083
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A heating element for use in an electric blanket or the like including conductors spaced apart in a positive temperature coefficient (PTC) material which serves as a self-limiting heater. The conductors are separated by a spacer which prevents the conductors from engaging each other when the PTC material softens or melts during annealing thereof. A coating of material having a higher melting point than the PTC material is placed over the PTC material to maintain its shape during the annealing process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.