Granted Patent
Utility
US 5,496,923 · App. 08/305,785
Purification process of aliphatic polyester
Inventors:
Hiroshi Suizu, Masatoshi Takagi, Masanobu Ajioka, Akihiro Yamaguchi
Patented Case
View Patent ↗
Granted: Mar 5, 1996
Filed: Sep 14, 1994
Inventors
Hiroshi Suizu
Masatoshi Takagi
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.