Patent US2808492A successfully refreshed from Google Patents.
US2808492A
Expired / Lapsed
US
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Electric heating units and methods of making the same
Assignee: General Electric Co
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Filing: 1954-07-26
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Granted: 1957-10-01
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Expires: 1974-07-26
Abstract
No abstract record available.
Inventors
- 👤 Charles H Yohe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:29
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/16; Y; Y10; Y10S; Y10S65/00; Y10S65/04; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083; Y10T29/49087; Y10T29/49092
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
AN ELECTRIC HEATING UNIT COMPRISING A METALLIC RESISTANCE CONDUCTOR, A LAYER OF FILAMENTS ENCLOSING SAID RESISTANCE CONDUCTOR, SAID FILAMENTS CONSISTING ESSENTIALLY OF SILICA, ALSO CONTAINING NON-SILICOUS METAL OXIDES, THE RATIO OF THE SILICA TO THE METHAL OXIDES BEING IN EXCESS OF 9, SAID FILAMENTS HAVING A MELTING POINT IN EXCESS OF 1950*F., AND A METALLIC SHEATH ENCLOSING BOTH SAID LAYER OF FLAMENTS AND SAID RESISTANCE CONDUCTOR AND RETAINING SAID LAYER OF FILAMENTS IN COMPRESSION ABOUT SAID RESISTANCE CONDUCTOR SO THAT SAID RESISTANCE CONDUCTOR IS MAINTAINED IN SPACED RELATIN WITH RESPECT TO SAID SHEATH.
Claim 2
Dependent Claim
93 words
AN ELECTRIC HEATING UNIT COMPRISING A METALLIC RESISTANCE CONDUCTOR, A LAYER OF FILAMENTS ENCLOSING SAID RESISTANCE CONDUCTOR, SAID FILAMENTS CONSISTING ESSENTIALLY OF SILICA, ALSO CONTAINING NON-SILICOUS METAL OXIDES, THE RATIO OF THE SILICA TO THE METHAL OXIDES BEING IN EXCESS OF 9, SAID FILAMENTS HAVING A MELTING POINT IN EXCESS OF 1950*F., AND A METALLIC SHEATH ENCLOSING BOTH SAID LAYER OF FLAMENTS AND SAID RESISTANCE CONDUCTOR AND RETAINING SAID LAYER OF FILAMENTS IN COMPRESSION ABOUT SAID RESISTANCE CONDUCTOR SO THAT SAID RESISTANCE CONDUCTOR IS MAINTAINED IN SPACED RELATIN WITH RESPECT TO SAID SHEATH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |