US3304408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric heating devices
Assignee: General Electric Co
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Filing: 1964-07-16
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Granted: 1967-02-14
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Expires: 1984-07-16
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Finch
- 👤 Skogland Thorbjorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:28
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; H05B3/44; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49945
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
AN ELECTRIC HEATING DEVICE COMPRISING AN INNER RING MEMBER HAVING AN EXTERNAL TAPERED SURFACE, AN OUTER RING MEMBER FORMED WITH AN INTERNAL TAPERED SURFACE, MEANS FOR GENERATING HEAT INCLUDING A HELICAL COIL OF RESISTANCE WIRE DISPOSED AROUND THE EXTERNAL TAPERED SURFACE OF SAID INNER RING MEMBER, SHIM MEANS DISPOSED AROUND SAID HELICAL COIL, AND ELECTRICAL INSULATING AND HEAT CONDUCTING MEANS INTERPOSED AND COMPRESSIVELY SANDWICHED BETWEEN SAID SHIM MEANS AND SAID EXTERNAL TAPERED SURFACE OF SAID INNER RING MEMBER TO EMBED SAID RESISTANCE WIRE IN SAID ELECTRICAL INSULATING AND HEAT CONDUCTING MEANS.
Claim 2
Dependent Claim
91 words
AN ELECTRIC HEATING DEVICE COMPRISING AN INNER RING MEMBER HAVING AN EXTERNAL TAPERED SURFACE, AN OUTER RING MEMBER FORMED WITH AN INTERNAL TAPERED SURFACE, MEANS FOR GENERATING HEAT INCLUDING A HELICAL COIL OF RESISTANCE WIRE DISPOSED AROUND THE EXTERNAL TAPERED SURFACE OF SAID INNER RING MEMBER, SHIM MEANS DISPOSED AROUND SAID HELICAL COIL, AND ELECTRICAL INSULATING AND HEAT CONDUCTING MEANS INTERPOSED AND COMPRESSIVELY SANDWICHED BETWEEN SAID SHIM MEANS AND SAID EXTERNAL TAPERED SURFACE OF SAID INNER RING MEMBER TO EMBED SAID RESISTANCE WIRE IN SAID ELECTRICAL INSULATING AND HEAT CONDUCTING MEANS.
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) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |