Granted Patent
Utility
US 5,169,885 · App. 07/601,774
Bis[2-tert-butyl-4-(2-octadecyloxycarbonylethyl)-6-methylphenyl ]phosphite useful as a stabilizing agent
Inventors:
Naoki Hanayama, Kazuo Nakagawa, Nobuyuki Hayashi, Akiyoshi Onishi
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Oct 30, 1990
Inventors
Naoki Hanayama
Kazuo Nakagawa
Nobuyuki Hayashi
Akiyoshi Onishi
Assignees (at issue)
Yoshitomi Pharmaceutical Industries, Ltd.
Mitsubishi Petrochemical Company Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.