Granted Patent
Utility
US 4,482,756 · App. 06/511,111
Production of hydroquinones
Inventors:
Chao-Yang Hsu, James E. Lyons
Patented Case
View Patent ↗
Granted: Nov 13, 1984
Filed: Jul 5, 1983
Inventors
Chao-Yang Hsu
James E. Lyons
Assignee (at issue)
SUN-TECH LIMITED
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.