US2774972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flapper discharge valve for flush tanks
Assignee: Crane Co
•
Filing: 1953-12-10
•
Granted: 1956-12-25
•
Expires: 1973-12-10
Abstract
No abstract record available.
Inventors
- 👤 Axel B Nelson
- 👤 Edward G Schmidt
- 👤 Roy H Zinkil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:59
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/20; F16K1/2014; E; E03; E03D; E03D1/00; E03D1/30; E03D1/304; E03D1/306; F16K1/2028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1201416A
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US1163716A
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US2112630A
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US2217380A
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US2142393A
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US2190160A
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US2242146A
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US2270469A
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US2378613A
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US2602933A
Cited
US2598967A
Cited
US2643393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |