US2334992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating drilling barge
Assignee: Shell Development Co
•
Filing: 1940-10-08
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Granted: 1943-11-23
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Expires: 1960-10-08
Abstract
No abstract record available.
Inventors
- 👤 Crake Wilfred St Maur Elmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:39
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/021; E02B2017/0039; E02B2017/0047; E02B2017/0056; E02B2017/0073; E02B2017/0082; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0801
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-11-22 | 1947-05-24 | 1947-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-11-22 | 1951-05-24 | 1951-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-11-22 | 1955-05-24 | 1955-11-23 | $7700.00 | Window Closed / Lapsed |