US2735443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic bi-directional flow valves
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
•
Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:27
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/18; F16K17/19; F16K17/196; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1797; Y10T137/1804; Y10T137/7722; Y10T137/7771; Y10T137/7772; Y10T137/7774; Y10T137/7777; Y10T137/778
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US587094A
Cited
US1342985A
Cited
US1885121A
Cited
US2191614A
Cited
US2191636A
Cited
US2573983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |