Patent US3447340A successfully refreshed from Google Patents.
US3447340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient unit for drill strings
Assignee: Smith International Inc
•
Filing: 1967-05-29
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Granted: 1969-06-03
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Expires: 1987-05-29
Abstract
No abstract record available.
Inventors
- 👤 William R Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:26
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07; E21B17/073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2246418A
Cited
US2449841A
Cited
US3033011A
Cited
US3263446A
Cited
US3254508A
Cited
US3274798A
Cited
US3350900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |