Granted Patent
Utility
US 5,223,583 · App. 07/518,428
Process for producing polyalkylene oxide derivatives
Inventors:
Toshihiko Higuchi, Shigeyuki Kozawa
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: May 3, 1990
Inventors
Toshihiko Higuchi
Shigeyuki Kozawa
Assignee (at issue)
ASAHI GLASS CO., 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.