Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1996-11-12
1998-01-27
Walker, W. L.
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
210489, 210498, 55278, B01D 2946
Patent
active
057118779
ABSTRACT:
A thin metal foil disc etched on both sides in such a way as to form a crossover pattern of rectangular flow passages (or channels) spiraling out, in opposite directions, from the inner diameter to the outer diameter of the disc. In the preferred embodiment, these channels have a depth slightly greater than half of the disc thickness, creating an opening through the thickness of the disc at their points of intersection. This disc design, when stacked appropriately into a filter element, provides substantially lower flow losses than other existing designs. When used as a filter, it performs as an absolute surface filter featuring a tortuous flow path and high degree of porosity. When used as a surface tension device, it offers superior wetting and re-wetting characteristics.
REFERENCES:
patent: 3111963 (1963-11-01), Brockwell
patent: 3700111 (1972-10-01), Bode
patent: 4267045 (1981-05-01), Hoof
patent: 4410430 (1983-10-01), Hagler
patent: 4664814 (1987-05-01), Backman et al.
patent: 4681681 (1987-07-01), Drori
patent: 4726900 (1988-02-01), Keskinen
patent: 4774000 (1988-09-01), Kawai et al.
patent: 5015381 (1991-05-01), Ellion et al.
patent: 5296134 (1994-03-01), Zaiter
patent: 5580454 (1996-12-01), Zaiter
Vacco Industries
Walker W. L.
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