Granted Patent
Utility
US 4,649,217 · App. 06/475,646
Process for producing oxocarboxylic acids
Inventors:
Takao Maki, Kenji Murayama, Yoshio Asahi
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Mar 15, 1983
Inventors
Takao Maki
Kenji Murayama
Yoshio Asahi
Assignee (at issue)
Mitsubishi Chemical 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.