Granted Patent
Utility
US 5,545,712 · App. 08/518,279
Preparation process for polyoxyalkylene polyol
Inventors:
Tomoki Tsutsui, Tsukuru Izukawa, Kazuhiko Ohkubo, Yoshitsugu Sakaki
Patented Case
View Patent ↗
Granted: Aug 13, 1996
Filed: Aug 23, 1995
Inventors
Tomoki Tsutsui
Tsukuru Izukawa
Kazuhiko Ohkubo
Yoshitsugu Sakaki
Assignee (at issue)
Mitsu Toatsu Chemicals, Inc.
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.