Granted Patent
Utility
US 5,226,932 · App. 07/772,340
Enhanced meambrane gas separations
Inventor:
Ravi Prasad
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Oct 7, 1991
Inventor
Ravi Prasad
Assignee (at issue)
Praxair Technology, 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.