Patent US2576288A successfully refreshed from Google Patents.
US2576288A
Expired / Lapsed
US
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Method and apparatus for filtering
Assignee: Commonwealth Engineering Company of Ohio
•
Filing: 1947-12-30
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Granted: 1951-11-27
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Expires: 1967-12-30
Abstract
No abstract record available.
Inventors
- 👤 Albert O Fink
- 👤 David E Bench
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/44; B01D33/46; B01D33/466; B01D33/80; B01D33/82; B01D37/00; B01D37/02; B01D37/04
Claims Analysis
Total Claims: 0
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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) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |