Granted Patent
Utility
US 5,371,285 · App. 08/038,283
Method of producing keto acids
Inventors:
Masahiro Kondo, Michio Tanaka, Naoya Sakamoto, Hajime Ooyoshi
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Mar 29, 1993
Inventors
Masahiro Kondo
Michio Tanaka
Naoya Sakamoto
Hajime Ooyoshi
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.