US3600307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid purification system
Assignee: Johns Manville Corp
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Filing: 1968-03-12
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Granted: 1971-08-17
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Expires: 1988-03-12
Abstract
Abstract SUSPENDED ORGANIC MATTER IS CONTINUOUSLY REMOVED FROM SEWAGE IN A MOVING BED FILTER IN WHICH WASTE WATER FLOW COUNTERCURRENT TO A COMPACT MOVING BED OF A PARTICULAR FILTER MEDIUM SUCH AS SAND. FILTRATION IS PREFERABLY CARRIED OUT IN AN INCLINED FRUSTO-CONICAL CHAMBER IN WHICH THE FILTER MEDIUM MOVES UPWARDLY. THE APPARATUS CAN ALSO BE USED FOR LIQUID TREATMENT PROCESSES OTHER THAN FILTRATION. D R A W I N G
Inventors
- 👤 Edward C Kehoe
- 👤 Robert Rinaldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:55
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/03; B01D24/00; B01D24/28; B01D24/30; B01D24/46; B01D24/4631
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |