Granted Patent
Utility
US 4,995,946 · App. 07/419,557
Method and apparatus for achieving balanced flow on multipass distillation trays
Inventor:
Robert Auger
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Oct 10, 1989
Inventor
Robert Auger
Assignee (at issue)
Aristech Chemical Company
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.