Patent ID: 7566106

Claim:
A refill unit for refilling an ink cartridge, the ink cartridge containing a colored ink and forming part of an inkjet printer, the inkjet printer also having a printhead and control circuitry, the refill unit comprising: a body containing a quantity of colored ink; an ink outlet having a unique configuration, the unique configuration being unique to the color of ink contained in the body, the ink outlet is configured to releasably engage a correspondingly uniquely configured interface of the ink cartridge containing ink of the same color as the refill unit; and, a memory circuit for storing ink information relating to at least one characteristic of the ink, the memory circuit being read by the control circuitry of the inkjet printer to retrieve the stored ink information to: further verify that the ink in the refill unit is suitable for refilling the ink cartridge; and modifying the maximum print speed of the printhead in response to the information stored on the memory circuit.