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Patent US2937007A successfully refreshed from Google Patents.
US2937007A
Expired / Lapsed
US
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Well drilling system
Assignee: Individual
•
Filing: 1955-11-21
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Granted: 1960-05-17
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Expires: 1975-11-21
Abstract
No abstract record available.
Inventors
- 👤 Whittle Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:22
CPC Classifications
E; E21; E21B; E21B44/00; E21B44/005; E21B17/00; E21B17/02; E21B17/04; E21B17/07; E21B4/00; E21B4/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2353534A
Cited
GB368957A
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US2609182A
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US2585995A
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US2567451A
Cited
US2684835A
Cited
US2655344A
Cited
US2809013A
Cited
US2761651A
Cited
US2776817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |