US2602635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling rig
Assignee: National Supply Co
•
Filing: 1945-12-03
•
Granted: 1952-07-08
•
Expires: 1965-12-03
Abstract
No abstract record available.
Inventors
- 👤 Forrest J Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:54
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; E21B3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2051249A
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US1992912A
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US1990810A
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US2243156A
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US2246478A
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US2354235A
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US2316131A
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US2344681A
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US2309285A
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US2339450A
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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) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |