US3501919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for carrying out operations at an underwater installation
Assignee: Shell USA Inc
•
Filing: 1968-02-28
•
Granted: 1970-03-24
•
Expires: 1988-02-28
Abstract
No abstract record available.
Inventors
- 👤 Peter W Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:43
CPC Classifications
E; E02; E02B; E02B17/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3036438A
Cited
US3047078A
Cited
US3256537A
Cited
US3236055A
Cited
US3224204A
Cited
US3379245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |