US3517520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of connecting underwater pipelines
Assignee: Shell USA Inc
•
Filing: 1968-06-20
•
Granted: 1970-06-30
•
Expires: 1988-06-20
Abstract
No abstract record available.
Inventors
- 👤 Dillard S Hammett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:52
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/01; E21B43/0107; F; F16; F16L; F16L1/00; F16L1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3431739A
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 |