US3307982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten-base alloys
Assignee: Duracell Inc USA
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Filing: 1964-02-17
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Granted: 1967-03-07
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 Edward J Milligan
- 👤 James C Kenney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:57
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/04; C22F; C22F1/00; C22F1/002; C22F1/16; C22F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A PROCESS FOR HEAT-TREATING AN ALLOY CONSISTING OF 75-99% TUGSTEN, BALANCE NICKEL AND COPPER, THE STEPS OF HEATING THE ALLOY TO A TEMPERATURE OF 500-1200*C. IN A NEUTRAL ATMOSPHERE, QUENCHING RAPIDLY, REHEATING TO A TEMPERATURE OF 350-600*C. IN A SUBSTANTIALLY NEUTRAL ATMOSPHERE OF ONE-HALF TO TWELVE HOURS AND QUENCHING, TO INCREASE ELONGATION AND TENSILE STRENGTH.
Claim 2
Dependent Claim
56 words
IN A PROCESS FOR HEAT-TREATING AN ALLOY CONSISTING OF 75-99% TUGSTEN, BALANCE NICKEL AND COPPER, THE STEPS OF HEATING THE ALLOY TO A TEMPERATURE OF 500-1200*C. IN A NEUTRAL ATMOSPHERE, QUENCHING RAPIDLY, REHEATING TO A TEMPERATURE OF 350-600*C. IN A SUBSTANTIALLY NEUTRAL ATMOSPHERE OF ONE-HALF TO TWELVE HOURS AND QUENCHING, TO INCREASE ELONGATION AND TENSILE STRENGTH.
References Cited (Backward Citations)
US2655457A
Cited
US2793951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |