Patent US2946341A successfully refreshed from Google Patents.
US2946341A
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Unidirectional check valve
Assignee: Sullivan Valve and Engineering Co
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Filing: 1957-02-21
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Granted: 1960-07-26
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Expires: 1977-02-21
Abstract
No abstract record available.
Inventors
- 👤 Timothy J Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:56
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/16; F16K31/165; F16K15/00; F16K15/02; F16K15/03; F16K17/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607; Y10T137/261; Y10T137/7722; Y10T137/7781; Y10T137/7783; Y10T137/8593; Y10T137/87917
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) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |