Ink pen has ink reservoir closed fluid and air tight from atmosphere through ring-shaped stopper fixed at back of shaft and closed on its front end by semi-permeable sealing disc

摘要

The ink pen has an ink reservoir (10) which can be closed fluid-tight and air-tight from the atmosphere through a ring-shaped stopper (34) seated fixed at the back end (32) of the shaft (12) and through a semi-permeable sealing disc (38) which is held by the front end (36) of the stopper and closes the stopper at the front. The ring opening of the stopper can be filled out by a labyrinth plug.