Granted Patent
Utility
US 5,637,631 · App. 08/553,984
Preparation process of degradable polymer
Inventors:
Ikumi Kitada, Chojiro Higuchi, Masanobu Ajioka, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Jun 10, 1997
Filed: Nov 6, 1995
Inventors
Ikumi Kitada
Chojiro Higuchi
Masanobu Ajioka
Akihiro Yamaguchi
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.