US2675823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backflow preventer
Assignee: Individual
•
Filing: 1949-09-07
•
Granted: 1954-04-20
•
Expires: 1969-09-07
Abstract
No abstract record available.
Inventors
- 👤 Jesse D Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:37
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/102; E03C1/104; E03C1/108; F16K15/1401; F16K15/145; F16K15/148; F16K2200/00; F16K2200/20; F16K2200/203; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7843
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US127038A
Cited
US155668A
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US280212A
Cited
US2098886A
Cited
US2113615A
Cited
US2322631A
Cited
US2270737A
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US2382427A
Cited
US2371449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |