US 11,987,068 B2
Marking pen
Yusuke Kobayashi, Shinagawa-ku (JP); Toru Nakajima, Shinagawa-ku (JP); Akiko Hirayama, Shinagawa-ku (JP); and Koji Takada, Shinagawa-ku (JP)
Assigned to MITSUBISHI PENCIL COMPANY, LIMITED, Shinagawa-ku (JP)
Appl. No. 17/759,387
Filed by MITSUBISHI PENCIL COMPANY, LIMITED, Shinagawa-ku (JP)
PCT Filed Jan. 14, 2021, PCT No. PCT/JP2021/001085
§ 371(c)(1), (2) Date Jul. 25, 2022,
PCT Pub. No. WO2021/157314, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 2020-019066 (JP), filed on Feb. 6, 2020.
Prior Publication US 2023/0086315 A1, Mar. 23, 2023
Int. Cl. B43K 24/08 (2006.01); B43K 8/02 (2006.01); B43K 8/08 (2006.01); B43K 8/24 (2006.01); B43K 25/02 (2006.01); C09D 11/16 (2014.01)
CPC B43K 24/08 (2013.01) [B43K 8/022 (2013.01); B43K 8/026 (2013.01); B43K 8/08 (2013.01); B43K 8/24 (2013.01); B43K 25/02 (2013.01); C09D 11/16 (2013.01)] 5 Claims
OG exemplary drawing
 
1. 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.