US2665885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for offshore coring
Assignee: Shell Development Co
•
Filing: 1948-10-25
•
Granted: 1954-01-12
•
Expires: 1968-10-25
Abstract
No abstract record available.
Inventors
- 👤 John R Gignoux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:47
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/124; Y; Y10; Y10S; Y10S173/00; Y10S173/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |