US3489436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for hanging well bore casing
Assignee: Vetco Inc
•
Filing: 1965-10-23
•
Granted: 1970-01-13
•
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 10:34
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043; E21B33/10; E21B33/13; E21B33/14; E21B33/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3273646A
Cited
US3098525A
Cited
US3215204A
Cited
US3179448A
Cited
US3335799A
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) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |