ALUMINUM NITRIDE CIRCUIT BOARD AND METHOD OF PRODUCING SAME An aluminum nitride circuit board includes an aluminum nitride ceramic body. An inner conductor metal which is to be used as a wiring material is formed in the aluminum nitride ceramic body. The inner conductor metal is mainly made of copper, a melting point of which is lower than a firing temperature of the aluminum nitride ceramic. A la...

A driveshaft assembly has external profiled teeth at its end and a slide-on hub with a shaft bore with corresponding inner profiled teeth. A first securing mechanism form-fittingly engages a groove or thread radially cut into the profiled teeth and provided at the free end of the driveshaft and axially supporting the hub in the direction of the end of the driveshaft. External profiled teeth, which...

The apparatus (18) comprises an ultrasonic wave generator device and an ultrasonic wave receiving device which are combined to form one structural unit (20). This structural unit (20) emits ultrasonic wave impulses along a sound path (30) into the interior of an electrical cell (10). The ultrasonic wave impulses are reflected by reflector (28), the electrolyte surface (32) and the base of the cell...