Patent US3429035A successfully refreshed from Google Patents.
US3429035A
Expired / Lapsed
US
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Method of making a heating element
Assignee: Thermel Inc
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Filing: 1965-06-16
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Granted: 1969-02-25
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Expires: 1985-06-16
Abstract
No abstract record available.
Inventors
- 👤 William H Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:22
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/42; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083; Y10T29/49087; Y10T29/49089; Y10T29/49091; Y10T29/49096
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF MAKING AN ELECTRIC HEATER COMPRISING COVERING A LENGTH OF RESISTANCE WIRE WITH A LAYER OF WOVEN REFRASIL MATERIAL COMPLETELY ENCIRCLING AND COVERING THE WIRE, FORMING THE WIRE AND MATERIAL INTO A CONTINUOUS HELICAL SHAPE, AXIALLY INSERTING THE HELICALLY SHAPED WIRE AND WOVEN REFRASIL MATERIAL INTO A TUBULAR METAL SHEATH, AND SWAGING THE TUBULAR SHEATH REDUCING ITS DIAMETER COMPRESSING SAID REFRASIL MATERIAL WITHOUT ADDING ADDITIONAL INSULATION SO THAT SAID REFRASIL MATERIAL CONSISTS OF THE SOLE INSULATION BETWEEN THE WIRE COILS AND FILLS THE VOIDS WITHIN THE SHEATH.
Claim 2
Independent Claim
89 words
THE METHOD OF MAKING AN ELECTRIC HEATER COMPRISING COVERING A LENGTH OF RESISTANCE WIRE WITH A LAYER OF WOVEN REFRASIL MATERIAL COMPLETELY ENCIRCLING AND COVERING THE WIRE, FORMING THE WIRE AND MATERIAL INTO A CONTINUOUS HELICAL SHAPE, AXIALLY INSERTING THE HELICALLY SHAPED WIRE AND WOVEN REFRASIL MATERIAL INTO A TUBULAR METAL SHEATH, AND SWAGING THE TUBULAR SHEATH REDUCING ITS DIAMETER COMPRESSING SAID REFRASIL MATERIAL WITHOUT ADDING ADDITIONAL INSULATION SO THAT SAID REFRASIL MATERIAL CONSISTS OF THE SOLE INSULATION BETWEEN THE WIRE COILS AND FILLS THE VOIDS WITHIN THE 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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |