Patent US2389412A successfully refreshed from Google Patents.
US2389412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antibackflow and antisiphonage valve
Assignee: Individual
•
Filing: 1941-09-26
•
Granted: 1945-11-20
•
Expires: 1961-09-26
Abstract
No abstract record available.
Inventors
- 👤 Carlton Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:31
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/106; E03C1/108; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622; Y10T137/7722; Y10T137/7781; Y10T137/7783; Y10T137/7793; Y10T137/7805; Y10T137/8593; Y10T137/87917; Y10T137/88054
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1948-11-19 | 1949-05-21 | 1949-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-11-19 | 1953-05-21 | 1953-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-11-19 | 1957-05-21 | 1957-11-20 | $7700.00 | Window Closed / Lapsed |