Abstract: A drying appliance having a drying chamber and a process air guide for guiding drying air through the drying chamber. The process air guide has a heat exchanger for cooling process air which includes a charge of humidity and particulates, and which is disposed downstream of the drying chamber within the process air guide. The heat exchanger is coated at least partially with a polymer coating on a part of a surface of the heat exchanger. The part of the surface below the coating has a passivating layer interposed between the coating and the surface.

Abstract: A laundry treatment appliance having a drum; a motor to drive the drum; a control device, in which an acoustic reference signal is stored; an acoustic sensor to measure an acoustic signal; and a comparator to compare the acoustic signal recorded by the acoustic sensor with the acoustic reference signal stored in the control device; wherein each of the acoustic signal and the acoustic reference signal is a sonogram.

Abstract: In a process for determining the amount of time elapsed between stopping a motor vehicle engine and restarting the engine, when the engine is restarted, the time information representing the time when the engine was stopped is subtracted from the time information representing the time when the engine was restarted. The time information representing the respective times is obtained from an on-board clock that serves to display the time in the motor vehicle.