MUMBAI, India, Sept. 28 -- Intellectual Property India has published a patent application (202647110910 A) filed by Kabushiki Kaisha Pilot Corporation Also Trading As; and The Pilot Ink Co. , Ltd. on September 16, 2026, for Oil-Based Ink Composition For Writing Board And Writing Utensil Containing Same.
Inventor includes Satake, Ryosuke.
The application for the patent was published on September 25, 2026, under issue no. 39/2026.
Abstract: Disclosed are: an oil-based ink composition for a writing board, the oil-based ink composition containing at least a pigment, an organic solvent, a polyvinyl acetal resin that is represented by general formula (1) and has a glass transition temperature of 75°C to 120°C inclusive, and a release agent; and a writing utensil which contains the oil-based ink composition for a writing board. In the formula, p, q, r, and s represent composition ratios, p may be 0, but q, r, and s each have a value that is greater than 0, and the sum of p, q, r, and s is 100.
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