Patent US1524916A successfully refreshed from Google Patents.
US1524916A
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US
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Filtering process and apparatus therefor
Assignee: DARCO Corp
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Filing: 1920-07-13
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Granted: 1925-02-03
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Expires: 1940-07-13
Abstract
No abstract record available.
Inventors
- 👤 Rod A Demme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:27
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/25; B01D29/76; B01D29/86; B01D29/88; B01D29/885
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) | 1928-02-03 | 1928-08-04 | 1929-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-02-03 | 1932-08-04 | 1933-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-02-03 | 1936-08-04 | 1937-02-03 | $7700.00 | Window Closed / Lapsed |