Granted Patent
Utility
US 6,540,813 · App. 09/839,920
Method of preparing composite gas separation membranes from perfluoropolymers
Inventors:
Joyce K. Nelson, Benjamin Bikson, James Timothy Macheras
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Apr 20, 2001
Inventors
Joyce K. Nelson
Benjamin Bikson
James Timothy Macheras
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.