US2665888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for unscrewing pipe
Assignee: Houston Oil Field Material Co Inc
•
Filing: 1948-05-10
•
Granted: 1954-01-12
•
Expires: 1968-05-10
Abstract
No abstract record available.
Inventors
- 👤 Robbins M Claypool
- 👤 David M Best
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:48
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; B; B25; B25B; B25B13/00; B25B13/48; B25B13/50; B25B13/5008; B25B13/5083; B25B13/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1200612A
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US1367500A
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US1507991A
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US1370073A
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US1627842A
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US1674798A
Cited
US1653341A
Cited
US1870540A
Cited
US1636262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |