Abstract: An active carbon coated filter element is proposed for preventing the issuance of hydrocarbons from an opening. It includes a medium containing active carbon, which is of substantially planar shape and has a frame. The frame is provided with sealing lips on at least two sides. The medium is arranged with the frame in a plastic holder, the plastic holder being able to be inserted and fixed in the opening. The sealing lips engage the wall of the opening.

Abstract: An active carbon coated filter element is proposed for preventing the issuance of hydrocarbons from an opening. It includes a medium containing active carbon, which is of substantially planar shape and has a frame. The frame is provided with sealing lips on at least two sides. The medium is arranged with the frame in a plastic holder, the plastic holder being able to be inserted and fixed in the opening. The sealing lips engage the wall of the opening.

Abstract: An air intake filter for internal combustion engines has a flat, replaceable filter insert 20, through which the air flows transversely in operation, and which has a gasket 22 disposed on the periphery for sealing at the face side against a ledge 15 of the filter housing 11. The insert can be inserted into the filter housing through a narrow side, the sealing pressure being produced by a cover 50 which has two sliding wedges 51 and 53. To bring it about that, when the sealing pressure is applied, the gasket 22 will not be shifted laterally with respect to the ledge 15 of the filter housing 11, the cover, which is in the form of a substantially open frame, replaceably accommodates the filter insert. The cover is provided with cams 40 and 41 which serve to fix the frame 30 in an extended position during the replacement of the filter insert.

Abstract: An x-ray image intensifier having a tube bulb and an output window being mounted in a metal frame. The frame is inserted into the tube bulb and attached to the tube bulb in a region of the output window characterized by the output window being a glass window having a luminophor layer applied thereto, the output window being connected to the frame by only a single metal solder connection of soft solder so that the pane having the luminophor layer can be soldered to the frame without damaging the luminophor layer. Preferably, a peripheral edge of the window pane is free of the luminophor layer, and this peripheral edge has at least one adhesive layer deposited at the location for the solder connection.