US2091903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating tungsten carbide
Assignee: Hughes Tool Co
•
Filing: 1935-11-04
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Granted: 1937-08-31
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Expires: 1955-11-04
Abstract
No abstract record available.
Inventors
- 👤 Henry T Baggett
- 👤 Gorham W Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5626; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5184
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) | 1940-08-30 | 1941-03-01 | 1941-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-30 | 1945-03-01 | 1945-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-30 | 1949-03-01 | 1949-08-31 | $7700.00 | Window Closed / Lapsed |