Patent US2804086A successfully refreshed from Google Patents.
US2804086A
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Reversible check valve
Assignee: John Blue Co Inc
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Filing: 1954-12-06
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Granted: 1957-08-27
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Expires: 1974-12-06
Abstract
No abstract record available.
Inventors
- 👤 Johnston Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:32
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/025; F04; F04B; F04B53/00; F04B53/10; F04B53/102; F04B53/103; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6161; Y10T137/6164; Y10T137/6167; Y10T137/7504; Y10T137/7559; Y10T137/7668; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861; Y10T137/7862; Y10T137/7865; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7935
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US190469A
Cited
US215800A
Cited
US569884A
Cited
US1204898A
Cited
US1529440A
Cited
US1677056A
Cited
US1976464A
Cited
US2257209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |