US2412428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unloading double check valve
Assignee: PESCO PRODUCTS CO
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Filing: 1943-12-24
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Granted: 1946-12-10
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Expires: 1963-12-24
Abstract
No abstract record available.
Inventors
- 👤 Edward A Rockwell
- 👤 Jay M Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:17
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/048; G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/101; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2612; Y10T137/2615; Y10T137/2622; Y10T137/7722; Y10T137/7781; Y10T137/7832; Y10T137/7837; Y10T137/7904; Y10T137/7922
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) | 1949-12-09 | 1950-06-10 | 1950-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-12-09 | 1954-06-10 | 1954-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-12-09 | 1958-06-10 | 1958-12-10 | $7700.00 | Window Closed / Lapsed |