Filter elements for gas or liquid and methods of making such elements
US4111815A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Mar 18, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/25
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter element for gas or liquid comprises a layer of glass, ceramic, metal, mineral wool or organic fibers containing, wholly within the layer, an apertured sheet, for example of steel or aluminum, the fibers being bound to one another throughout the layer and through the apertures, as well as to the sheet itself, by a synthetic resin such as silicone resin or polyurethane. The filter element is formed by mounting the apertured sheet a selected distance above a filter surface on which the fibers build up while a slurry containing the fibers is drained through the filter surface. When the fibers have built up to a predetermined distance above the sheet, the fibers containing the sheet are removed and the assembly impregnated with a synthetic resin and cured. Two or more grades of slurry mixture may be used in succession to produce a density grading through the thickness of the fibrous layer. In the case of cylindrical elements, end caps are fitted and made fluid tight by a synthetic resin, a taper fit or a gasket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.