Patent ID: 7611235

Claim:
A method for preventing the refill of a cartridge having a central reservoir defined therein, said method comprising the steps of: providing a drill resistant cage disposed within the central reservoir of the cartridge, wherein said drill resistant cage prevents a refiller from drilling into the central reservoir with a drill having a bit and introducing a refill ink; providing a drill bit grabbing mesh disposed within said drill resistant cage, wherein said bit grabbing mesh would impede attempts to drill into the central reservoir; providing a series of pressure valves within the central reservoir, wherein said pressure valves would close to prevent the introduction of refill ink into the central reservoir by means of a pressure differential; providing an ink altering material contained within one or more ink altering packets disposed in the central reservoir, wherein said ink altering packets would open during attempted refill and release said ink altering material thus fouling the ink and preventing use of the cartridge.