US2630875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backwater valve
Assignee: Individual
•
Filing: 1950-02-03
•
Granted: 1953-03-10
•
Expires: 1970-02-03
Abstract
No abstract record available.
Inventors
- 👤 Hans W Sachs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:23
CPC Classifications
E; E03; E03F; E03F5/00; E03F5/04; E03F5/042; Y; Y10; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4463; Y10T137/4471; Y10T137/4478; Y10T137/4486; Y10T137/7287; Y10T137/7306; Y10T137/7722; Y10T137/7758; Y10T137/7761; Y10T137/7837; Y10T137/7838; Y10T137/7842; Y10T137/8158; Y10T137/8342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |