Ballpoint pen cartridge
AssigneeAnanda Anlageanstalt
InventorWerner Germann
Life of this patent
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Abstract
A ball point pen cartridge comprising an elongated tube having one end open, a socket mounted in the other, a ball rotatably mounted in the socket, a marking fluid within the tube in contact with the ball and means for hermetically sealing the other end of the tube with a hydraulic seal while exerting pressure on the fluid.
Claims8
A ball point marking instrument comprising an outer tube having each end open, a ball point registered adjacent to one end of said outer tube, a marking liquid within said outer tube, said marking liquid in contact with the ball of said ball point, and an inner tube having one open end and one closed end and initially containing a gas, said inner tube being inserted into sealing relation with said outer tube to a depth at which the open end penetrates said marking liquid so that the gas within said inner tube is compressed in a space between said marking liquid and said closed end to exert pressure on said marking liquid and to thereby force said marking liquid against said ball point.
Dependencies are inferred from the claim text.