Granted Patent
Utility
US 5,444,143 · App. 08/170,873
Preparation process of polyhydroxycarboxylic acid
Inventors:
Masahiro Ohta, Shoji Obuchi, Yasunori Yoshida
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Dec 21, 1993
Inventors
Masahiro Ohta
Shoji Obuchi
Yasunori Yoshida
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.