Granted Patent
Utility
US 4,405,823 · App. 06/411,122
Process for the production of phenols
Inventors:
Takao Maki, Tetsuo Masuyama, Toshiharu Yokoyama
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Aug 24, 1982
Inventors
Takao Maki
Tetsuo Masuyama
Toshiharu Yokoyama
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.