US2938353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submersible drilling barge
Assignee: Shell USA Inc
•
Filing: 1954-12-27
•
Granted: 1960-05-31
•
Expires: 1974-12-27
Abstract
No abstract record available.
Inventors
- 👤 Egbert R Vorenkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:20
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/021; B; B63; B63B; B63B21/00; B63B21/24; B63B21/26; E02D; E02D27/00; E02D27/32; E02D27/52; E02B2017/0056; E02B2017/0073; E02B2017/0086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US720997A
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US1971046A
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FR978769A
Cited
US2622404A
Cited
US2699042A
Cited
US2591599A
Cited
US2589146A
Cited
US2677935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |