US2389413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing backflow or back-siphonage in pressure systems
Assignee: Individual
•
Filing: 1944-01-17
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Granted: 1945-11-20
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Expires: 1964-01-17
Abstract
No abstract record available.
Inventors
- 👤 Carlton Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:18
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/06; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0379; Y10T137/3149; Y10T137/7722; Y10T137/7738; Y10T137/774; Y10T137/7781; Y10T137/7783; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7927; Y10T137/8593; Y10T137/87169; Y10T137/87233; Y10T137/87241; Y10T137/87917
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) | 1948-11-19 | 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 |