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Patent US3749569A successfully refreshed from Google Patents.
US3749569A
Expired / Lapsed
US
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Electrical resistance alloys
Assignee: Carpenter Technology Corp
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Filing: 1971-07-22
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Granted: 1973-07-31
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Expires: 1991-07-22
Abstract
Abstract OXIDATION RESISTANT ELECTRICAL RESISTANT ALLOYS ARE DISCLOSED THAT HAVE A NICKEL BASE AND CONTAIN FROM 0.5 TO 5% BY WEIGHT OF SILICON AND 0.01 AND 0.04% BY WEIGHT OF CALCIUM AND FROM ABOUT 50 P.P.M. TO 180 P.P.M. BY WEIGHT OF OXYGEN IN THE FORM OF SILICON DIOXIDE (SIO2) AND CALCIUM OXIDE (CAO) IN THE MOLAR RATIO SIO2 TO CAO OF LESS THAN ONE. A METHOD FOR MAKING THE ALLOY IS DISCLOSED. THESE ALLOYS ARE ELECTRICAL RESISTANCE ALLOYS WHICH HAVE UNIFORM LONG LIFE UNDER OXIDIZING CONDITIONS.
Inventors
- 👤 C Starr
- 👤 R Steinitz
- 👤 Po Wang Teh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:57
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/007; H; H01; H01B; H01B1/00; H01B1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |