An ink containment system for an inkjet cartridge, for storing ink for printing, comprises a housing having a plurality of walls. A rigid basin member and a rigid moveable plate are disposed within the housing. A flexible membrane is affixed to a surface of the basin member and to a surface of the plate...http://www.google.com.au/patents/US8091993?utm_source=gb-gplus-sharePatent US8091993 - Ink containment system and ink level sensing system for an inkjet cartridge
