Patent US1285646A successfully refreshed from Google Patents.
Patent US2621067A successfully refreshed from Google Patents.
US2621067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for removing extraneous matter from well shafts
Assignee: Individual
•
Filing: 1949-09-01
•
Granted: 1952-12-09
•
Expires: 1969-09-01
Abstract
No abstract record available.
Inventors
- 👤 Jacobson Ole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:56
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/12; E21B31/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1315581A
Cited
US987242A
Cited
US1000817A
Cited
US1171315A
Cited
US1298702A
Cited
US1462099A
Cited
US1470114A
Cited
US1498172A
Cited
US1509001A
Cited
US1824191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |