US2778757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburized tungsten alloy article
Assignee: Firth Sterling Inc
•
Filing: 1953-08-28
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Granted: 1957-01-22
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Expires: 1973-08-28
Abstract
No abstract record available.
Inventors
- 👤 William W Wellborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:45
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/64; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12458
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2242254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |