Granted Patent
Utility
US 5,646,238 · App. 08/503,768
Preparation process of polyhydroxycarboxylic acid
Inventors:
Kan Ikeda, Shoji Obuchi, Masahiro Ohta
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Jul 18, 1995
Inventors
Kan Ikeda
Shoji Obuchi
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.