Filter cores
Abstract
Abstract THE PRESENT INVENTION RELATES TO FILTERS, FOR EXAMPLE DISC TYPE FILTERS USEFUL IN THE PRODUCTION OF POLYMERS. MORE PARTICULARLY, IT RELATES TO DISC TYPE FILTER CORES WHICH SERVE AT LEAST TWO FUNCTIONS, (1) ADDING SUPPORT TO THE FILTER MEDIA, AND (2) PROVIDING CONTINUOUS FILTRATE FLOW PASSAGES DURING THE FILTERING PROCESS ATTENDANT TO SUCH PRODUCTION. EACH FILTER CORE COMPRISES AT LEAST TWO DISCS IN FACE-TO-FACE RELATION, AT LEAST ONE OF THE DISCS HAVING ELONGATED APERTURES THEREIN AND AT LEAST ONE OF OTHER DISC HAVING AT LEAST ONE ELONGATED FILTRATE CONDUIT MEANS THEREIN. THE APERTURES AND THE FILTRATE CONDUIT MEANS COOPERATIVELY FORM A CONTINUOUS FLUID PASSAGE SUCH THAT, FOR EXAMPLE, FOR A GIVEN FILTRATE FLOW VELOCITY, FILTER MEDIA SUPPORT MAY BE MAXIMIZED.
Inventors
- 👤 Raymond C Clark
Bibliographic Details
Claims Analysis
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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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |