Granted Patent
Utility
US 4,355,190 · App. 06/215,123
Process for recovery of resorcinol from aqueous resorcinol solution containing hydroquinone
Inventors:
Hirohiko Nambu, Fujihisa Matsunaga, Hiroaki Nakagawa
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Dec 10, 1980
Inventors
Hirohiko Nambu
Fujihisa Matsunaga
Hiroaki Nakagawa
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.