Granted Patent
Utility
US 5,017,729 · App. 07/402,528
Phenol preparation process and propylene recovery therefrom
Inventors:
Hiroshi Fukuhara, Fujihisa Matsunaga
Patented Case
View Patent ↗
Granted: May 21, 1991
Filed: Sep 5, 1989
Inventors
Hiroshi Fukuhara
Fujihisa Matsunaga
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.