US2602639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill bit
Assignee: Individual
•
Filing: 1948-07-19
•
Granted: 1952-07-08
•
Expires: 1968-07-19
Abstract
No abstract record available.
Inventors
- 👤 Gwylam G Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:56
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/003; E21B10/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USRE20468E
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US2294004A
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US2499282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |