Granted Patent
Utility
US 5,345,772 · App. 08/062,959
Single column distillative separation employing bottom additives
Inventor:
Richard Hopewell
Patented Case
View Patent ↗
Granted: Sep 13, 1994
Filed: May 14, 1993
Inventor
Richard Hopewell
Assignee (at issue)
Process Systems International, Inc.
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.