Granted Patent
Utility
US 5,770,683 · App. 08/546,311
Preparation process of polyhydroxycarboxylic acid
Inventors:
Yasunori Yoshida, Michihiko Miyamoto, Shoji Obuchi, Kan Ideda, Masahiro Ohta
Patented Case
View Patent ↗
Granted: Jun 23, 1998
Filed: Oct 20, 1995
Inventors
Yasunori Yoshida
Michihiko Miyamoto
Shoji Obuchi
Kan Ideda
Masahiro Ohta
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.