Granted Patent
Utility
US 5,468,840 · App. 08/296,604
Preparation process of polyoxyalkylene polyols and process of alkylene oxide recovery
Inventors:
Tomoki Tsutsui, Tsukuru Izukawa, Kazuhiko Ohkubo, Yoshitsugu Sakaki
Patented Case
View Patent ↗
Granted: Nov 21, 1995
Filed: Aug 29, 1994
Inventors
Tomoki Tsutsui
Tsukuru Izukawa
Kazuhiko Ohkubo
Yoshitsugu Sakaki
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.