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| Number | Title | Issue Date |
| 4472184 | Support and holding frame for air filtering elements A support and holding frame for supporting an air filtering element of the type that is of the nonself-supporting type. The invention comprises a frame adapted to hold the filtering element and consists of a three-sided sheet metal box having its upper an... | 09/18/1984 |
| 4334900 | Filter elements arranged in waste tanks for separating substances which are harmful to the health from flowing air in connection with nuclear installations Filter elements with changing devices and contamination protection are disclosed. The filter elements are installed in waste tanks and serve to separate substances which are prejudicial to the health when breathed and are used to process air of ventilatio... | 06/15/1982 |
| 4197098 | Filter bypass measurement section A damping tube-shaped bypass measurement section with protective maintenance features and continuous flow velocity scanning on absorptive filtration units in the nuclear engineering field is disclosed. The bypass measurement section comprises a tube-shape... | 04/08/1980 |
| 4193844 | Method of mounting filter elements and mounting therefor A process for the insertion and exchange of the filter elements for suspended matter is performed from the clean-air-side. During the insertion of a filter element, a plastic tube (which encircles the circumference of the filter element and which exceeds ... | 03/18/1980 |
| 4095965 | Absorption filter An absorption filter for the purification of gas or air streams, especially gas or air streams which contain toxic or radioactive contaminants.... | 06/20/1978 |
