US2637172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Offshore drilling platform
Assignee: Richardson & Bass
•
Filing: 1948-07-08
•
Granted: 1953-05-05
•
Expires: 1968-07-08
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:51
CPC Classifications
E; E02; E02B; E02B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US947237A
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US1718006A
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US1892125A
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US2210408A
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US2327118A
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US2373319A
Cited
US2422168A
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US2539695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |