US1575907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering and thickening process and apparatus
Assignee: General Engineering Co Ltd
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Filing: 1921-04-11
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Granted: 1926-03-09
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Expires: 1941-04-11
Abstract
No abstract record available.
Inventors
- 👤 Genter Albert Legrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:53
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/16; B01D29/00; B01D29/39; B01D29/395; B01D29/50; B01D29/52; B01D35/12
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) | 1929-03-08 | 1929-09-07 | 1930-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-03-08 | 1933-09-07 | 1934-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-03-08 | 1937-09-07 | 1938-03-09 | $7700.00 | Window Closed / Lapsed |