A printer performs a printing operation by driving a cartridge to discharge ink. The ink in the printer is billed according to the amount of actual use of ink. In a service center, the head ID is first input. Then, the head ID is verified against the user ID. The amount of the use of ink is checked....http://www.google.fr/patents/US7373305?utm_source=gb-gplus-shareBrevet US7373305 - Accounting apparatus, accounting method, and computer-readable program storage medium for storing program having accounting function
Accounting apparatus, accounting method, and computer-readable program ...
