Patent ID: 8454149

Claim:
An inkjet printing system, comprising: a print head in fluid communication with an ink reservoir and having a plurality of orifices and a corresponding plurality of associated ejection chambers, comprising: a substrate; a barrier layer disposed on the substrate, the barrier layer defining in part a plurality of fluid channels and the plurality of ejection chambers, where the barrier layer comprises a material selected from epoxy-based photo resist materials and methyl methacrylate-based photo resist materials; and an orifice plate disposed over the substrate, the orifice plate including the plurality of orifices in fluid communication with the ejection chambers, wherein the orifice plate comprises a material selected from polyimides and nickel, wherein the system is capable of storing an organic solvent-based ink for a period of at least six months, wherein any dissolving, delaminating, shrinking, or swelling of print head materials during the period of at least six months does not materially affect the printing performance of the system.