Patent ID: 8882253

Claim:
An ink cartridge adapted to be detachably attached to an ink jet recording apparatus, the ink cartridge comprising: an ink storing chamber; an atmosphere communicating connection port communicated with the ink storing chamber and adapted to communicate the ink storing chamber with atmosphere, the atmosphere communicating connection port having a first valve member configured to close automatically when the ink cartridge is detached from the ink jet recording apparatus; and an ink supplying connection port communicated with the ink storing chamber and located below the atmosphere communicating connection port, the ink supplying connection port having a second valve member configured to close automatically when the ink cartridge is detached from the ink jet recording apparatus, wherein the atmosphere communicating connection port and the ink supplying connection port are configured to be opened when the ink cartridge is attached to the ink jet recording apparatus being in a state to perform recording operations, and wherein an open side of the ink storing chamber is sealed with a film.