Patent US3528497A successfully refreshed from Google Patents.
US3528497A
Expired / Lapsed
US
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Offshore holding apparatus
Assignee: Atlantic Richfield Co
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Filing: 1968-05-21
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Granted: 1970-09-15
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Expires: 1988-05-21
Abstract
No abstract record available.
Inventors
- 👤 Kenneth A Lehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:01
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/128; E21B33/00; E21B33/02; E21B33/03; E21B33/035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |