Flexible blanket heater
US4695703A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1986 |
| Grant date | Sep 22, 1987 |
| Priority date | — |
| Expiry date | Apr 25, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/033
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved flexible blanket heater includes a thin, normally flat flexible blanket of elastic dielectric material having a high modulus of elasticity and defining top and bottom surfaces. An elongate flexible resistance element of an alloy having a lower modulus of elasticity than said dielectric material and positioned within and arranged to extend about and throughout the plane of the blanket. The blanket has welts at its top and bottom surfaces adjacent and coextensive with the element. The welts establish curved compacted element supporting masses about the inside circumference of the element when the blanket is bent and which serve to limit bending of the element to radii at which the modulus of elasticity of the element is not exceeded. The blanket includes flexible fabric reinforcements at its surfaces which prevent free elastic flow and displacement of the dielectric material and assure compacting of that material about the inside circumference of bends at the welts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.