Granted Patent
Utility
US 4,469,491 · App. 06/369,961
Separation of diisopropylether from hydrocarbon streams
Inventor:
Lawrence H. Finkel
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Apr 19, 1982
Inventor
Lawrence H. Finkel
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.