Patent US3541004A successfully refreshed from Google Patents.
US3541004A
Expired / Lapsed
US
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Cleaning an ultrafilter with an elongated,reciprocating,agitator
Assignee: Kovalus Separation Solutions LLC
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Filing: 1968-06-10
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Granted: 1970-11-17
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Expires: 1988-06-10
Abstract
No abstract record available.
Inventors
- 👤 William W Cooper
- 👤 Russell W Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:59
CPC Classifications
B; B01; B01D; B01D65/00; B01D65/02; B01D2321/00; B01D2321/20; B01D2321/2033; B01D2321/2041; B01F; B01F31/00; B01F31/44; B01F31/441
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |