US2587333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse flow adapter for wells
Assignee: Individual
•
Filing: 1950-05-15
•
Granted: 1952-02-26
•
Expires: 1970-05-15
Abstract
No abstract record available.
Inventors
- 👤 Kelley Kork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:01
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/34; E21B43/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1628900A
Cited
US2491587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |