GENEVA, March 31 -- PENTEL KABUSHIKI KAISHA (7-2, Nihonbashi Koami-cho, Chuo-ku, Tokyo1038538), ぺんてる株式会社 (東京都中央区日本橋小網町７番２号) filed a patent application (PCT/JP2025/033013) for "OIL-BASED INK COMPOSITION AND WRITING INSTRUMENT" on Sep 19, 2025. With publication no. WO/2026/063504, the details related to the patent application was published on Mar 26, 2026.
Notably, the patent application was submitted under the International Patent Classification (IPC) system, which is managed by the World Intellectual Property Organization (WIPO).
Inventor(s): OHYAMA, Asako (c/o Pentel Kabus...