Patent US3935481A successfully refreshed from Google Patents.
Patent US2992918A successfully refreshed from Google Patents.
US2992918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical resistors and materials therefor
Assignee: Kanthal AB
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Filing: 1960-07-06
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Granted: 1961-07-18
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Expires: 1980-07-06
Abstract
No abstract record available.
Inventors
- 👤 Edwin Bjorn
- 👤 Hildebrand Gosta Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:11
CPC Classifications
H; H01; H01B; H01B1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
AN ELECTRIC RESISTOR COMPRISING WIRES OF A DIAMETER OF FROM .0005 TO .0031" AND DRAWN FROM AN ALLOY CONSISTING OF 10 TO 30% BY WEIGHT CHROMIUM, 2.6 TO 6% BY WEIGHT SILICON, .4 TO 6% BY WEIGHT MANGANESE AND THE BALANCE NICKEL AND ANNEALED FOR A LENGTH OF TIME FROM 1 SECOND UPWARDS AT A TEMPERATURE OF 850 TO 950*C. AND SUBSEQUENTLY AGE ANNEALED FOR A LENGTH OF TIME FROM 1/2 HOUR UP TO 24 HOURS AT A TEMPERATURE OF 425 TO 525*C., SAID WIRE HAVING AN ELECTRIC RESISTANCE HIGHER THAN 1.20 OHM MM.2/M. AND A TEMPERATURE COEFFICIENT OF RESISTANCE BELOW 55 X 10**6 OHM/OHM/*C.
Claim 2
Dependent Claim
105 words
AN ELECTRIC RESISTOR COMPRISING WIRES OF A DIAMETER OF FROM .0005 TO .0031" AND DRAWN FROM AN ALLOY CONSISTING OF 10 TO 30% BY WEIGHT CHROMIUM, 2.6 TO 6% BY WEIGHT SILICON, .4 TO 6% BY WEIGHT MANGANESE AND THE BALANCE NICKEL AND ANNEALED FOR A LENGTH OF TIME FROM 1 SECOND UPWARDS AT A TEMPERATURE OF 850 TO 950*C. AND SUBSEQUENTLY AGE ANNEALED FOR A LENGTH OF TIME FROM 1/2 HOUR UP TO 24 HOURS AT A TEMPERATURE OF 425 TO 525*C., SAID WIRE HAVING AN ELECTRIC RESISTANCE HIGHER THAN 1.20 OHM MM.2/M. AND A TEMPERATURE COEFFICIENT OF RESISTANCE BELOW 55 X 10**6 OHM/OHM/*C.
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) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |