Patent US2829868A successfully refreshed from Google Patents.
US2829868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire line core barrel
Assignee: EJ Longyear Co
•
Filing: 1953-08-14
•
Granted: 1958-04-08
•
Expires: 1973-08-14
Abstract
No abstract record available.
Inventors
- 👤 Pickard Albert Frank
- 👤 Walter W Svendsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:38
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1898261A
Cited
US2020599A
Cited
US2073876A
Cited
US2128102A
Cited
US2080978A
Cited
US2189057A
Cited
US2184361A
Cited
US2247729A
Cited
US2551995A
Cited
US2708103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |