Granted Patent
Utility
US 5,386,004 · App. 08/130,442
Polyhydroxycarboxylic acid and purification process thereof
Inventors:
Shoji Obuchi, Masahiro Ohta
Patented Case
View Patent ↗
Granted: Jan 31, 1995
Filed: Oct 1, 1993
Inventors
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.