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 05:53
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/12; E21B31/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1315581A
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US987242A
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US1000817A
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US1171315A
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US1298702A
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US1462099A
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US1470114A
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US1498172A
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US1509001A
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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 |