Patent US3359525A successfully refreshed from Google Patents.
US3359525A
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US
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Electric heating element
Assignee: EIDP Inc
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Filing: 1964-10-14
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Granted: 1967-12-19
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Expires: 1984-10-14
Abstract
No abstract record available.
Inventors
- 👤 Leo P Hubbuch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:17
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
AN ELECTRIC HEATING ELEMENT HEAT-STABLE UP TO TEMPERATURES OF ABOUT 600*F. WHICH COMPRISES: (A) AN ELECTRIC HEAT GENERATING UNIT COMPRISING CARBON DISPERSED IN A BINDER OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYIMIDES, AROMATIC POLYAMIDES AND AROMATIC POLYBENZIMIDAZOLES, SAID UNIT HAVING MEANS FOR CONNECTING IT TO AN ELECTRIC POWER SOURCE; AND (B) AN ELECTRICALLY-INSULATING HEAT CONDUCTIVE COATING IN ADHERENT CONTACT WITH THE SURFACE OF SAID UNIT, SAID COATING COMPRISING A POLYMER SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYIMIDES, AROMATIC POLYAMIDES AND AROMATIC POLYBENZIMIDAZOLES.
Claim 2
Dependent Claim
87 words
AN ELECTRIC HEATING ELEMENT HEAT-STABLE UP TO TEMPERATURES OF ABOUT 600*F. WHICH COMPRISES: (A) AN ELECTRIC HEAT GENERATING UNIT COMPRISING CARBON DISPERSED IN A BINDER OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYIMIDES, AROMATIC POLYAMIDES AND AROMATIC POLYBENZIMIDAZOLES, SAID UNIT HAVING MEANS FOR CONNECTING IT TO AN ELECTRIC POWER SOURCE; AND (B) AN ELECTRICALLY-INSULATING HEAT CONDUCTIVE COATING IN ADHERENT CONTACT WITH THE SURFACE OF SAID UNIT, SAID COATING COMPRISING A POLYMER SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYIMIDES, AROMATIC POLYAMIDES AND AROMATIC POLYBENZIMIDAZOLES.
References Cited (Backward Citations)
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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) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |