Underdrain system for water filtration plant
Abstract
Abstract AN UNDERDRAIN SYSTEM FOR WATER FILTRATION PLANT, WHEREIN A FILTER BASIN HAS A FLOOR AND UPWARDLY-EXTENDING WALLS RISING THEREFROM TO DEFINE A CRIB FOR HOLDING FILTER MEDIA, THE BASIN HAVING A GULLET IN ITS FLOOR. ROWS OF UNDERDRAIN BLOCKS ARE PROVIDED ON THE FLOOR AND ADJACENT UNDERDRAIN BLOCKS ARE END-ABUTTED WITH COMPRESSED SEALING RINGS BEING INTERPOSED THEREBETWEEN TO FORM WATER-TIGHT JOINTS. MOREOVER, A ROW OF GULLET BLOCKS ARE CENTERED OVER THE GULLET, AND THESE BLOCKS ARE SIDE-ABUTTED, WITH COMPRESSED RINGS BEING ARRANGED BETWEEN THE SIDES OF ADJACENT GULLET BLOCKS TO FORM WATER-TIGHT JOINTS. THE LATTER SEALING RINGS EXTEND BETWEEN THE FLOOR OF THE FILTER BASIN AND THE BOTTOMS OF THE GULLET BLOCKS TO PROVIDE WATER-TIGHT JOINTS. BOTH TYPES OF BLOCKS DEFINE WATER PASSAGEWAYS IN THEIR INTERIORS, AND ALL OF THE ABOVEMENTIONED BLOCKS HAVE TOP WALLS FORMED WITH HOLES THEREIN, WHEREBY FILTERED WATER MAY FLOW FROM THE FILTER MEDIA TO THE GULLET, AND BACKWASH WATER MAY BE CONVEYED FROM THE GULLET TO AND THROUGH THE FILTER MEDIA IN A REVERSE DIRECTION TO CLEAN THE MEDIA.
Inventors
- 👤 Fred J Early Jr
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |