US1839518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming tungsten carbide
Assignee: Hughes Tool Co
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Filing: 1929-11-07
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Granted: 1932-01-05
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Expires: 1949-11-07
Abstract
No abstract record available.
Inventors
- 👤 Gorham W Woods
- 👤 Henry B Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:13
CPC Classifications
F; F23; F23C; F23C99/00; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/949; F23C2700/00; F23C2700/04; F23C2700/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-01-04 | 1935-07-06 | 1936-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-01-04 | 1939-07-06 | 1940-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-01-04 | 1943-07-06 | 1944-01-05 | $7700.00 | Window Closed / Lapsed |