US2687875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drill
Assignee: Hughes Tool Co
•
Filing: 1951-11-20
•
Granted: 1954-08-31
•
Expires: 1971-11-20
Abstract
No abstract record available.
Inventors
- 👤 Erwin A Morlan
- 👤 Floyd L Scott
- 👤 Henry B Woods
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:38
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/14; A47J27/16; A47J27/08; A47J27/0804; E; E21; E21B; E21B10/00; E21B10/08; E21B10/16; E21B10/46; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US474297A
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US1010127A
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US1502851A
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US1885085A
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US2121202A
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US2117679A
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US2194675A
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US2244617A
Cited
US2234273A
Cited
US2626128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |