Patent US2984310A successfully refreshed from Google Patents.
US2984310A
Expired / Lapsed
US
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Rotary drill apparatus
Assignee: Individual
•
Filing: 1957-04-29
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Granted: 1961-05-16
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Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Charles A Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:58
CPC Classifications
E; E21; E21B; E21B23/00; E21B4/00; E21B4/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1406350A
Cited
US1530803A
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US1870697A
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US2609182A
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US2713433A
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US2652926A
Cited
US2643087A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |