Friction body
AssigneeSociete BIC
InventorMyriam Oger
Life of this patent
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Abstract
A friction body for discoloring handwriting written with a thermochromic ink with frictional heat, the friction body including a surface portion configured to generate frictional heat when manually rubbed on a porous substrate. The surface portion may have a thermal effusivity of less than about 300 J K−1 m−2 s−1/2.
Claims19
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−1 m−2 s−1/2.
A friction body for discoloring handwriting written with a thermochromic ink with frictional heat, wherein the friction body comprises a first surface portion comprising bark material, and wherein the friction body comprises a second surface portion comprising natural cork.
Dependencies are inferred from the claim text.