US2481894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sludge handling method and apparatus
Assignee: Yeomans Brothers Co
•
Filing: 1945-03-19
•
Granted: 1949-09-13
•
Expires: 1965-03-19
Abstract
No abstract record available.
Inventors
- 👤 Yeomans Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:23
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/2931; Y10T137/2937; Y10T137/2947; Y10T137/2965; Y10T137/2975; Y10T137/7287; Y10T137/7358; Y10T137/7439; Y10T137/7475
Claims Analysis
Total Claims: 0
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US2383834A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |