US2638425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical resistor element and method of producing the same
Assignee: Wilbur B Driver Co
•
Filing: 1949-03-16
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Granted: 1953-05-12
•
Expires: 1969-03-16
Abstract
No abstract record available.
Inventors
- 👤 Victor O Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:40
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
AN ELECTRICAL RESISTANCE ELEMENT COMPRISING AN ALLOY CONSISTING OF ABOUT 3% AL, 3% CU, 10-30% CR, 1% EACH OF THE METALS FE AND MN, .50-1.0% SI, BALANCE SUBSTANTIALLY NICKEL, THAT HAS BEEN RECRYSTALLIZED ANNEALED AT A TEMPERATURE APPROXIMATING 1950* F. AND HEAT-TREATED FOR A PERIOD OF 1 TO 3 HOURS AT A TEMPERATURE WITHIN THE RANGE 780* TO 1000* F AND HAVING A TEMPERATURE COEFFICIENT BELOW .00008.
Claim 2
Dependent Claim
67 words
AN ELECTRICAL RESISTANCE ELEMENT COMPRISING AN ALLOY CONSISTING OF ABOUT 3% AL, 3% CU, 10-30% CR, 1% EACH OF THE METALS FE AND MN, .50-1.0% SI, BALANCE SUBSTANTIALLY NICKEL, THAT HAS BEEN RECRYSTALLIZED ANNEALED AT A TEMPERATURE APPROXIMATING 1950* F. AND HEAT-TREATED FOR A PERIOD OF 1 TO 3 HOURS AT A TEMPERATURE WITHIN THE RANGE 780* TO 1000* F AND HAVING A TEMPERATURE COEFFICIENT 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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |