Patent US3502143A successfully refreshed from Google Patents.
US3502143A
Expired / Lapsed
US
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Marine riser support system
Assignee: Shell USA Inc
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Filing: 1968-05-29
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Granted: 1970-03-24
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Expires: 1988-05-29
Abstract
No abstract record available.
Inventors
- 👤 William H Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:37
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/01; E21B19/00; E21B19/08; E21B19/09; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/038; E21B41/00; E21B41/10; E21B7/00; E21B7/12; E21B7/128
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3191696A
Cited
US3021909A
Cited
US3221817A
Cited
US3208728A
Cited
US3421581A
Cited
US3369600A
Cited
US3403728A
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 |