Patent US2533735A successfully refreshed from Google Patents.
US2533735A
Expired / Lapsed
US
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Electric resistance element and method of heat-treatment
Assignee: Driver Harris Co
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Filing: 1948-12-16
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Granted: 1950-12-12
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Expires: 1968-12-16
Abstract
No abstract record available.
Inventors
- 👤 James M Lohr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
AN ELECTRIC RESISTANCE ELEMENT COMPRISING AN ALLOY CONTAINING 10 TO 30 PERCENT CHROMIUM, 2 TO 4 PER CENT ALUMINUM, BALANCE NICKEL, THAT HAS BEEN ANNEALED AT A TEMPERATURE OF ABOUT 1700 DEGREE F. TO 2000*F. AND HEAT TREATED FOR A PERIOD OF ONE TO FIVE HOURS AT A TEMPERATURE OF 900*F. TO 1100*F., AND HAVING A TEMPERATURE COEFFICIENT OF RESISTANCE BELOW .00008.
Claim 2
Dependent Claim
62 words
AN ELECTRIC RESISTANCE ELEMENT COMPRISING AN ALLOY CONTAINING 10 TO 30 PERCENT CHROMIUM, 2 TO 4 PER CENT ALUMINUM, BALANCE NICKEL, THAT HAS BEEN ANNEALED AT A TEMPERATURE OF ABOUT 1700 DEGREE F. TO 2000*F. AND HEAT TREATED FOR A PERIOD OF ONE TO FIVE HOURS AT A TEMPERATURE OF 900*F. TO 1100*F., AND HAVING A TEMPERATURE COEFFICIENT OF RESISTANCE BELOW .00008.
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |