Granted Patent
Utility
US 4,478,752 · App. 06/423,984
Process for oxidizing phenol to p-benzoquinone
Inventors:
Chao-Yang Hsu, James E. Lyons
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: Sep 27, 1982
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.