US3468559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically actuated casing hanger
Assignee: Ventura Tool Co
•
Filing: 1965-10-23
•
Granted: 1969-09-23
•
Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur G Ahlstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:58
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3273646A
Cited
US2163422A
Cited
US3115933A
Cited
US3098525A
Cited
US3279539A
Cited
US3322193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |