Patent US1407873A successfully refreshed from Google Patents.
US1407873A
Expired / Lapsed
US
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Sealing off fluids in boreholes for oil wells
Assignee: Individual
•
Filing: 1921-04-02
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Granted: 1922-02-28
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Expires: 1941-04-02
Abstract
No abstract record available.
Inventors
- 👤 Liedbeck Carl Henrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:37
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1925-02-27 | 1925-08-29 | 1926-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-02-27 | 1929-08-29 | 1930-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-02-27 | 1933-08-29 | 1934-02-28 | $7700.00 | Window Closed / Lapsed |