Granted Patent
Utility
US 4,642,406 · App. 06/775,982
High severity process for xylene production employing a transalkylation zone for xylene isomerization
Inventor:
Robert J. Schmidt
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Sep 13, 1985
Inventor
Robert J. Schmidt
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.