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US 4,130,487 AGranted
Filters for liquids or gases
AssigneeProcess Scientific Innovations Limited
InventorsGeorge S. Hunter, Susanne P. Hunter, Brian Walker
Life of this patent
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AssigneeProcess Scientific Innovations Limited
InventorsGeorge S. Hunter, Susanne P. Hunter, Brian Walker
Estimating the term…
Filter elements are described in which a pleated cylindrical sheet of non-woven microporous glass fibre filter material impregnated with a binder, which may be silicone, polyurethane, phenolic resin or epoxy resin, is mounted in contact with a cylindrical supporting sheet of, for example, expanded metal for maintaining the filter material against shock pressure loads. To protect the filter material during assembly a porous layer of protective material may be interposed between the filter material and the supporting cylinder. The supporting cylinder may be a simple cylinder or pleated so as to fit the filter material. An activated carbon layer for removing odors during air filtration may be added to the filter material. When the air contains oil mist, a layer containing dye that will be taken up by the oil and discolor the filter element as a warning indication that the filter has become saturated, may be interposed between the filter material and the activated carbon layer. The filter material may comprise an organic binder holding together borosilicate glass fibres, this amorphous mass being further impregnated by a synthetic resin binder. The filter material may consist of a glass fibre filter paper with a further layer of non-woven material secured thereto by a synthetic resin binder.
A filter element for fluids comprising at least one cylindrical sheet of nonwoven microporous fibrous filter material impregnated with a synthetic resin binder, said filter material consisting of an amorphous mass of borosilicate glass fibers, a substantial quantity of said borosilicate glass fibers each having a diameter of between 0.5 to 9.0 microns and a length of between 1 and 2 mm, the remaining fibers having a length of up to 6 mm, said sheet being at least about 0.03 inches thick and formed with pleats over its entire area, said pleats being substantially parallel to the axis of said cylindrical sheet and presenting peaks internally and externally of said cylindrical sheet, the internal peaks being spaced from the external peaks by approximately 0.6 cm, and at least one perforate supporting cylinder of comparatively rigid material formed with perforations substantially over its whole area, said supporting cylinder being mounted closely adjacent to said cylindrical sheet to provide support for said sheet, said synthetic resin binder providing support for said borosilicate microporous fibrous material between said peaks.
A filter assembly comprising first and second filter elements and conduit means for passing a fluid to be filtered in succession through said filter elements;
Dependencies are inferred from the claim text.