US3460639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latch for drill bit control apparatus
Assignee: Smith International Inc
•
Filing: 1967-08-31
•
Granted: 1969-08-12
•
Expires: 1987-08-31
Abstract
No abstract record available.
Inventors
- 👤 William R Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:01
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/062; E21B17/00; E21B17/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2179567A
Cited
US2316409A
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US2819040A
Cited
US3042125A
Cited
US3105561A
Cited
US3326305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |