Patent US3664178A successfully refreshed from Google Patents.
US2668960A
Expired / Lapsed
US
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Valve arrangement for flush tanks
Assignee: Individual
•
Filing: 1951-04-13
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Granted: 1954-02-16
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Expires: 1971-04-13
Abstract
No abstract record available.
Inventors
- 👤 Barrett-Lennard Hardinge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:49
CPC Classifications
E; E03; E03D; E03D1/00; E03D1/30; E03D1/34; Y; Y10; Y10S; Y10S4/00; Y10S4/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1324136A
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US1396133A
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US2113205A
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US2121362A
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US2214439A
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US2260078A
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US2328701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |