US2676787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling equipment
Assignee: Individual
•
Filing: 1949-06-22
•
Granted: 1954-04-27
•
Expires: 1969-06-22
Abstract
No abstract record available.
Inventors
- 👤 Howard L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:34
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/01; E21B7/00; E21B7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US222690A
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US2336338A
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US2360361A
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US2217879A
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US2281717A
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US2480144A
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US2476309A
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US2475933A
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US2512783A
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US2503516A
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US2467113A
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US2503423A
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US2464911A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |