	US 12,240,266 B2
	Friction body
Myriam Oger, Clichy (FR)
Assigned to SOCIÉTÉ BIC, Clichy (FR)
Appl. No. 18/258,128
Filed by Société BIC, Clichy (FR)
PCT Filed Dec. 17, 2021, PCT No. PCT/EP2021/086489 § 371(c)(1), (2) Date Jun. 16, 2023, PCT Pub. No. WO2022/129522, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 20315499 (EP), filed on Dec. 18, 2020.
Prior Publication US 2024/0066911 A1, Feb. 29, 2024
Int. Cl. B43K 29/00 (2006.01); B43K 29/02 (2006.01); B43L 19/00 (2006.01)

CPC B43L 19/0025 (2013.01) [B43K 29/02 (2013.01)]

19 Claims

1. A friction body for discoloring handwriting written with a thermochromic ink with frictional heat,

wherein the friction body comprises a surface portion configured to generate frictional heat when manually rubbed on a porous substrate, and

wherein the surface portion has a thermal effusivity of less than about 300 J K⁻¹m⁻²s^−1/2.