US Patent Issued to MITSUBISHI CHEMICAL on Jan. 13 for "Bisphenol composition and polycarbonate resin" (Japanese Inventors)

ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,522,696, issued on Jan. 13, was assigned to MITSUBISHI CHEMICAL Corp. (Tokyo).

"Bisphenol composition and polycarbonate resin" was invented by Kei Uchiyama (Tokyo), Masashi Yokogi (Tokyo), Hiroki Shibata (Tokyo), Sora Tomita (Tokyo), Yuichi Yayama (Tokyo), Kenji Tsuruhara (Tokyo), Takayuki Yoshida (Tokyo), Yukie Nakashima (Tokyo), Rie Konishi (Tokyo) and Kazuo Hirowatari (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A bisphenol composition includes 95% or more by mass of a bisphenol and 200 mass ppm or more of a compound represented by the following general formula (II):In formula (II), R21 and R22 denote a methyl group or a hydrogen atom; R22 i...