US2372940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back siphonage prevention valve
Assignee: Individual
•
Filing: 1941-04-07
•
Granted: 1945-04-03
•
Expires: 1961-04-07
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:40
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/108; E03C1/104; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331; Y10T137/7722; Y10T137/7781; Y10T137/7835; Y10T137/8593; Y10T137/87571; Y10T137/87676; Y10T137/87684; Y10T137/87692
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-04-02 | 1948-10-02 | 1949-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-04-02 | 1952-10-02 | 1953-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-04-02 | 1956-10-02 | 1957-04-03 | $7700.00 | Window Closed / Lapsed |