US2300856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backwater control for sewers
Assignee: GEORGE J DEHN
•
Filing: 1941-04-04
•
Granted: 1942-11-03
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Expires: 1961-04-04
Abstract
No abstract record available.
Inventors
- 👤 Dennis H Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:28
CPC Classifications
E; E03; E03F; E03F7/00; E03F7/02; E03F7/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7313; Y10T137/7323; Y10T137/7358; Y10T137/7365; Y10T137/7423; Y10T137/7426; Y10T137/7436; Y10T137/7439; Y10T137/7475; Y10T137/8593; Y10T137/86292; Y10T137/86324
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) | 1945-11-02 | 1946-05-04 | 1946-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-11-02 | 1950-05-04 | 1950-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-11-02 | 1954-05-04 | 1954-11-03 | $7700.00 | Window Closed / Lapsed |