US2116422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backwater control for sewers
Assignee: Individual
•
Filing: 1937-04-19
•
Granted: 1938-05-03
•
Expires: 1957-04-19
Abstract
No abstract record available.
Inventors
- 👤 Dennis H Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:10
CPC Classifications
E; E03; E03F; E03F7/00; E03F7/02; E03F7/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2534; Y10T137/2536; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/4238; Y10T137/4245; Y10T137/4273; Y10T137/4336; Y10T137/6851; Y10T137/6966; Y10T137/6991; Y10T137/7287; Y10T137/7313; Y10T137/7323; Y10T137/7339; Y10T137/7355; Y10T137/7358; Y10T137/7365; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667
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) | 1941-05-02 | 1941-11-01 | 1942-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-05-02 | 1945-11-01 | 1946-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-05-02 | 1949-11-01 | 1950-05-03 | $7700.00 | Window Closed / Lapsed |