Patent US2489912A successfully refreshed from Google Patents.
US2489912A
Expired / Lapsed
US
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Method of producing tungsten alloys
Assignee: Westinghouse Electric Corp
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Filing: 1941-12-13
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Granted: 1949-11-29
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Expires: 1961-12-13
Abstract
No abstract record available.
Inventors
- 👤 William C Lilliendahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:23
CPC Classifications
C; C22; C22C; C22C27/00; C22C27/04; H; H01; H01K; H01K3/00; H01K3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1111698A
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US1496457A
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US1788243A
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US2012825A
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US1965222A
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US2107122A
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US2225239A
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US2206537A
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US2227445A
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US2227446A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |