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US2679262A
Expired / Lapsed
US
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Check valve for abrasives
Assignee: E-Z-On Corp
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Filing: 1953-03-18
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Granted: 1954-05-25
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Expires: 1973-03-18
Abstract
No abstract record available.
Inventors
- 👤 James W Barnett
- 👤 Frederick E Gillett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:14
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7931
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US326613A
Cited
US508464A
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US1002938A
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US1992043A
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US2082606A
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US2170478A
Cited
GB521728A
Cited
US2355862A
Cited
US2490511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |