US3546889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction of multiple pipe risers to offshore platforms
Assignee: Shell USA Inc
•
Filing: 1969-06-13
•
Granted: 1970-12-15
•
Expires: 1989-06-13
Abstract
No abstract record available.
Inventors
- 👤 Dean P Hemphill
- 👤 Douglas E Broussard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:15
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/12; F16L1/14; F16L1/15; E; E21; E21B; E21B43/00; E21B43/01; E21B43/0107; E02; E02B; E02B17/00; E02B2017/0095
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3434296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |