Granted Patent
Utility
US 6,790,263 · App. 09/661,902
Polymide gas separation membranes
Inventors:
Yong Ding, Benjamin Bikson, Joyce K. Nelson
Patented Case
View Patent ↗
Granted: Sep 14, 2004
Filed: Sep 14, 2000
Inventors
Yong Ding
Benjamin Bikson
Joyce K. Nelson
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.