Patent US3411596A successfully refreshed from Google Patents.
US3411596A
Expired / Lapsed
US
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Drilling apparatus
Assignee: ROBBINS MANUFACTURING Inc AN ALA CORP
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Filing: 1967-06-05
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Granted: 1968-11-19
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Expires: 1987-06-05
Abstract
No abstract record available.
Inventors
- 👤 Davis B Robbins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:00
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2849212A
Cited
US3089549A
Cited
US3157283A
Cited
US3083955A
Cited
US3185310A
Cited
US3315822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |