A process of producing an ink jet recording head of the type that has an electro-thermal converting element which forms a heating surface in the ink channel, comprises preparing a substrate having the heating surface formed thereon, forming a cover film on the heating surface so as to cover at least...http://www.google.com/patents/US5163177?utm_source=gb-gplus-sharePatent US5163177 - Process of producing ink jet recording head and ink jet apparatus having the ink jet recording head
