US2881841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically boosted anchor for wells
Assignee: Page Oil Tools Inc
•
Filing: 1954-07-06
•
Granted: 1959-04-14
•
Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 Jr John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/04; E21B23/0411; E21B23/04115; E21B23/0416; E21B23/042
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1972408A
Cited
US2603292A
Cited
US2352700A
Cited
US2624412A
Cited
US2698058A
Cited
US2703623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |