A method of providing a number approximating a total number of ink drops fired by an imaging device, including the steps of incrementing a COUNT variable associated with a color of ink if an ink drop of that color is fired by a printhead in the imaging device, evaluating the value of the COUNT variable...http://www.google.de/patents/US6601934?utm_source=gb-gplus-sharePatent US6601934 - Storage of total ink drop fired count in an imaging device
