Granted Patent
Utility
US 5,072,007 · App. 07/547,132
Process for preparing polyalkyl-2-alkoxy-7-hydroxychroman derivatives
Inventors:
Daisuke Fukuoka, Takeshi Ishitoku, Katsuya Takahashi, Takashi Tashiro, Junichi Imuta, Hiroaki Tan, Masaharu Ishiguro, Noriaki Kihara, Teruaki Mukaiyama
Patented Case
View Patent ↗
Granted: Dec 10, 1991
Filed: Jul 3, 1990
Inventors
Daisuke Fukuoka
Takeshi Ishitoku
Katsuya Takahashi
Takashi Tashiro
Junichi Imuta
Hiroaki Tan
Masaharu Ishiguro
Noriaki Kihara
Teruaki Mukaiyama
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.