Abstract: In a particle filter for exhaust gases of internal combustion engines, particularly Diesel engines, including a filter body with filter pockets which are formed from sinter metal sheets and are wedge-shaped with an opening at the blunt end and edges formed by converging pocket side walls and arranged adjacent one another such that, between adjacent filter pockets, corresponding opposite spaces are formed with openings facing in a direction opposite to the openings at the blunt end, the filter pockets side walls are spaced from one another by widening means extending along at least an edge of the filter pockets so as to increase the width of the space between the side walls of the filter pockets.

Abstract: In a particle filter with carbon (soot) deposit combustion for Diesel engines comprising a filter with filter areas of sinter metal through which exhaust gases from the Diesel engine are conducted to remove the soot therefrom, the soot collected at the raw gas side of the filter surfaces is burned off by radiation heaters which are arranged so as to radiate between wedge-like filter pockets of the particle filter such that selected areas of the filter are heated to initiate combustion of the soot on the filter surfaces.

Abstract: In a particle filter for exhaust gases of internal combustion engines, particularly Diesel engines, including a filter body with filter pockets which are formed from sinter metal sheets and are wedge-shaped with an opening at the blunt end and edges formed by converging pocket side walls and arranged adjacent one another such that, between adjacent filter pockets, corresponding opposite spaces are formed with openings facing in a direction opposite to the openings at the blunt end, the filter pockets side walls are spaced from one another by widening means extending along at least an edge of the filter pockets so as to increase the width of the space between the side walls of the filter pockets.

Abstract: In a particle filter with carbon (soot) deposit combustion for Diesel engines comprising a filter with filter areas of sinter metal through which exhaust gases from the Diesel engine are conducted to remove the soot therefrom, the soot collected at the raw gas side of the filter surfaces is burned off by radiation heaters which are arranged so as to radiate between wedge-like filter pockets of the particle filter such that selected areas of the filter are heated to initiate combustion of the soot on the filter surfaces.

Abstract: An electric-motor-driven window operating system for installation in motor vehicle doors with a drive unit (2) arranged in a damp-proof housing (1) and connected to a rotation speed sensor (30) and controllable by an electronic control and regulating unit (4). The electronic control and regulating unit (4), the drive unit (2) and the rotation speed sensor (3; 30, 31, 32) are arranged in a common damp-proof housing (1).

Abstract: A limiter circuit for alternating voltages includes a pair of zener diodes arranged in series but in opposite sense. Each zener diode forms an additional current mirror with a respective further transistor so that for each of the two possible directions of the limiter current it is possible to derive a limiter signal current which is decoupled from the actual limited current and which, unlike the actual limiter current, always flows in the same direction. Such a limiter circuit can be used in the input circuit of a bridge rectifier for ringing-current detection in electronic telephone sets connected to two-wire lines.

Abstract: An installation for the adjustment of the height of a headrest of a vehicle seat, especially of a motor vehicle seat, by means of a motor mounted in or at the vehicle seat, in which a sensor is provided that detects the seating height of a person seated on the vehicle seat in the normal position and controls the motor for the height adjustment of the headrest in accordance with the detection results.