Patent US3459302A successfully refreshed from Google Patents.
US3459302A
Expired / Lapsed
US
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Apparatus and method of filtering solids from a liquid effluent
Assignee: Zimpro Passavant Inc
•
Filing: 1967-04-25
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Granted: 1969-08-05
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Expires: 1987-04-25
Abstract
No abstract record available.
Inventors
- 👤 David S Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/004
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) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |