Patent ID: 6863460

Claim:
An ink cartridge for a reservoir pen having a hollow barrel, a feed bar, a nib carried on the feed bar and having a normal position and a flexed position, a socket in the feed bar, and a gush member accommodated in the socket and sized so that the nib in the normal position exerts an inward force on the push member, the ink cartridge comprising: a body sized for insertion into the pen barrel and defining a chamber adapted to hold ink; an ink discharge port through which ink from the chamber is discharged from the cartridge; and a resilient valve element coupled to the body and extending across the ink discharge port for controlling flow of ink therethrough, the valve element having an open condition in which the port is opened, and a closed condition in which the valve element is inwardly resiliently deformed to close the ink discharge port, the resilient valve element further being adapted to engage the push member so that the inward force exerted on the push member by the nib urges the valve element to the closed condition.