| 摘要 |
847,726. Gas filters. FIBREGLASS Ltd. May 26, 1959, No. 17859/59. Class 8(2). A replaceable gas filter unit comprises a corrugated sheet c of one or more layers of resin bonded fibres, e.g. glass carried by a marginal rim comprising an inner portion b nesting within an outer portion a. As shown the sheet c comprises three layers of decreasing porosity in the direction of flow ; the middle layer being coated with a wetting oil. |
