Reliable ink jet print head, ink jet head cartridge, ink container, and the manufacture method thereof are provided. Specifically, an ink supply opening of an ink container includes a beam member crossing the ink supply opening. The beam member is shaped so that filler material included therein is oriented...http://www.google.de/patents/US8025382?utm_source=gb-gplus-sharePatent US8025382 - Ink jet head cartridge, print head, ink container, and method for manufacturing ink jet head cartridge
