A recognition circuit for an ink jet printer has a plurality of heating cells. Each of the heating cells has a heating element coupled with a power line and a switch coupled with an address line. When voltages are applied to the power line and the address line, the switch is turned on and a current flows...http://www.google.es/patents/US6568783?utm_source=gb-gplus-sharePatente US6568783 - Recognition circuit for an ink jet printer
