Patent US3528686A successfully refreshed from Google Patents.
US3528686A
Expired / Lapsed
US
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Rotatable casing hanger apparatus
Assignee: Vetco Inc
•
Filing: 1968-06-24
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Granted: 1970-09-15
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Expires: 1988-06-24
Abstract
No abstract record available.
Inventors
- 👤 Bobby H Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:21
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043; E21B33/0415
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA697190A
Cited
US3273646A
Cited
US2310490A
Cited
US2660248A
Cited
US3198555A
Cited
US3163223A
Cited
US3215204A
Cited
US3279539A
Cited
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 |