US3539767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space heater having electrical resistance heating film
Assignee: Individual
•
Filing: 1966-10-28
•
Granted: 1970-11-10
•
Expires: 1986-10-28
Abstract
Abstract Space heating means and method having an electric resistance heating film comprising a meander pattern of conductive foil with terminals at least in part integral and of lower resistance than the pattern. The film may be disposed between two layers of which one is a floor or wall covering and the film being bonded to one of the layers and having at least one of the layers composed of a material supplied in roll form and laid in parallel adjacent lengths over a floor or wall surface and metallic strips connecting the heating film to a low voltage supply source.
Inventors
- 👤 Paul Eisler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:49
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/54; H05B3/56; F; F24; F24D; F24D13/00; F24D13/02; F24D13/022; F24D13/024; H05B3/02; H05B3/06; H05B3/10; H05B3/20; H05B3/22; H05B3/26; H05B3/565; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |