Granted Patent
Utility
US 5,203,889 · App. 07/846,802
Process and system for fractionating gaseous mixtures
Inventor:
Jeffrey Brown
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Mar 5, 1992
Inventor
Jeffrey Brown
Assignee (at issue)
Federal Signal Corporation
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.