US2690935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: GEORGE E FAILING Co
•
Filing: 1949-07-13
•
Granted: 1954-10-05
•
Expires: 1969-07-13
Abstract
No abstract record available.
Inventors
- 👤 Emmett L Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:26
CPC Classifications
F; F16; F16C; F16C43/00; F16C43/04; F16C43/06; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; F16C2352/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1762570A
Cited
US2011084A
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US1940839A
Cited
US1972256A
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US2009300A
Cited
US2080117A
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US2104823A
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US2334359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |