US2495642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wash valve for wells
Assignee: OIL CENTER TOOL CO
•
Filing: 1946-06-27
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Granted: 1950-01-24
•
Expires: 1966-06-27
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Penick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:57
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |