US3516491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater control system
Assignee: Hydril LLC
•
Filing: 1967-06-28
•
Granted: 1970-06-23
•
Expires: 1987-06-28
Abstract
No abstract record available.
Inventors
- 👤 George E Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:57
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/0355
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2614803A
Cited
US2872940A
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US3012510A
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US3086590A
Cited
US3186486A
Cited
US3211223A
Cited
US3199595A
Cited
US3163224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |