A self-aligning ring for receipt within the ink supply port of an ink cartridge is provided. The ring includes, on the side thereof facing the interior of the ink cartridge, a first annular seal member whose inner diameter is slightly smaller than the outer diameter of an ink supply needle of a recording...http://www.google.de/patents/US5633667?utm_source=gb-gplus-sharePatent US5633667 - Ink cartridge for printer
