Granted Patent
Utility
US 4,323,713 · App. 06/208,952
Preparation of mono-tertiary butylhydroquinone
Inventor:
Dusan J. Engel
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Nov 20, 1980
Inventor
Dusan J. Engel
Assignee (at issue)
UOP LLC
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.