Patent US3517735A successfully refreshed from Google Patents.
US3517735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater production facility
Assignee: Shell USA Inc
•
Filing: 1968-08-28
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Granted: 1970-06-30
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Expires: 1988-08-28
Abstract
No abstract record available.
Inventors
- 👤 William J Fairbanks
- 👤 William H Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:29
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/01; E21B43/017
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2783970A
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US3252528A
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US3221816A
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US3353364A
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US3302709A
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US3261398A
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US3373806A
Cited
US3321015A
Cited
US3366173A
Cited
US3391734A
Cited
US3464489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |