US2654388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backflow preventer
Assignee: Individual
•
Filing: 1944-11-07
•
Granted: 1953-10-06
•
Expires: 1964-11-07
Abstract
No abstract record available.
Inventors
- 👤 Glass Ann Thesing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:20
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/034; E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/104; E03C1/108; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622; Y10T137/5762; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7846; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US968794A
Cited
US1044623A
Cited
US1105991A
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US1198128A
Cited
US1668456A
Cited
US1648486A
Cited
US1693842A
Cited
US1765422A
Cited
FR747081A
Cited
US2068833A
Cited
US2162779A
Cited
US2303808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |