US3635824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance heater and method for preparation thereof
Assignee: AT&T Inc
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Filing: 1969-07-03
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Granted: 1972-01-18
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Expires: 1989-07-03
Abstract
Abstract A resistance heater comprising a sintered mass of refractory particles, each particle comprising an insulating core coated with a thin film of an electrically conducting material, is obtained by a processing sequence involving coating the particles of interest, compacting the coated particles to form a pellet and sintering the pellet. Devices produced in accordance with the described technique manifest enhanced reliability and uniformity as compared with prior art heaters, and permit a new degree of freedom in the design of heating elements.
Inventors
- 👤 Raymond G Brandes
- 👤 Charies M Pleass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:23
CPC Classifications
H; H05; H05B; H05B3/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
Method in accordance with claim 1 wherein sintering is conducted at a temperature greater than one-half the melting point of the said conductive material.
Claim 2
Dependent Claim
13 words
Method in accordance with claim 1 wherein compacting is effected by pressing techniques.
Claim 3
Dependent Claim
19 words
Method in accordance with claim 1 wherein said insulating material is aluminum oxide and said conductive material is molybdenum.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |