Granted Patent
Utility
US 5,180,871 · App. 07/839,683
Process for producing phenols
Inventors:
Fujihisa Matsunaga, Hiroshi Fukuhara, Mitsuki Yasuhara
Patented Case
View Patent ↗
Granted: Jan 19, 1993
Filed: Feb 24, 1992
Inventors
Fujihisa Matsunaga
Hiroshi Fukuhara
Mitsuki Yasuhara
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.