Patent US4019474A successfully refreshed from Google Patents.
Patent US3369618A successfully refreshed from Google Patents.
US3369618A
Expired / Lapsed
US
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Well drilling apparatus
Assignee: Individual
•
Filing: 1964-07-06
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Granted: 1968-02-20
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Expires: 1984-07-06
Abstract
No abstract record available.
Inventors
- 👤 Moore Buell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:36
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/64; E21B10/66; E21B10/26; E21B10/32; E21B10/34; E21B4/00; E21B4/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1112946A
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US1197882A
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US1395091A
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US1574040A
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US2133564A
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US2184817A
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US2609182A
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US2567451A
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US2890022A
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US2997119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |