Marking pen
AssigneeMitsubishi Pencil Company, Limited
InventorsYusuke Kobayashi, Toru Nakajima, Akiko Hirayama, Koji Takada
Life of this patent
Estimating the term…
Abstract
A marking pen, comprising: a shaft cylinder; a porous pen core accommodated in the shaft cylinder, and configured to project from, and retract into, an opening part provided at a tip end of the shaft cylinder; an inner cotton accommodated in the shaft cylinder, and filled with an aqueous ink composition to be fed to the pen core, the aqueous ink composition including a water soluble organic solvent in an amount of from 20 mass % to 60 mass %; and a delivery mechanism configured to cause a tip end of the pen core to project from, and retract into, the opening part.
Claims5
A marking pen, comprising:
- a shaft cylinder;
- a porous pen core accommodated in the shaft cylinder, and configured to project from, and retract into, an opening part provided at a tip end of the shaft cylinder;
- an inner cotton accommodated in the shaft cylinder, and filled with an aqueous ink composition to be fed to the pen core, the aqueous ink composition including a water soluble organic solvent in an amount of from 20 mass % to 60 mass %, a pigment, and a pigment dispersing agent;
- and
- a delivery mechanism configured to cause a tip end of the pen core to project from, and retract into, the opening part.
Dependencies are inferred from the claim text.