Abstract: An improved method and apparatus for modifying an inkjet cartridge for the use of separable ink reservoirs including a base plate designed to be snap fitted into a hollowed out cartridge shell and lever mechanism that cooperates with the base plate to enable the separable reservoir to fit different sizes of cartridges and to be easily removed from the cartridge.

Abstract: The present invention provides a refill insert that is couplable to an ink jet printhead. The refill insert comprises a housing that has an enclosed, defined volume therein for receiving a predetermined quantity of ink. Included substantially within the structure of the housing is a subhousing having an interior volume in fluid communication with the defined volume of the housing. The housing further includes an ink egress port and an air ingress port that is separated a distance from the ink egress port and are in fluid communication with the subhousing. The ink egress port, which is in fluid communication with the printhead, and the air ingress port may be located on a single wall of the subhousing or they may be located on separate walls of the subhousing. Additionally, the subhousing and the housing may share a common wall. The subhousing completely spans the distance separating the ink egress port and the air ingress port with the interior volume of the subhousing encompassing the ink egress port.

Abstract: A composition for use as an ink in thermal ink-jet printers comprising water, a compatible colorant, and certain 2-substituted 1,3-propanediols as humectants, the compositions providing a substantially kogation-free ink.

Abstract: A liquid dispensing syringe having a plunger unit that is non-retractable after liquid is dispensed. The syringe is only refillable by persons having special filling equipment.