Granted Patent
Utility
US 4,434,305 · App. 06/326,277
Process for production of hydroquinone
Inventors:
Nobuo Kurosaka, Makoto Yasuda, Tadateru Murakami
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Dec 1, 1981
Inventors
Nobuo Kurosaka
Makoto Yasuda
Tadateru Murakami
Assignee (at issue)
Mitsui Petrochemicals Industry, 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.