Granted Patent
Utility
US 6,716,270 · App. 10/350,230
Polyimide amic acid salts and polyimide membranes formed therefrom
Inventors:
Yong Ding, Benjamin Bikson, Joyce K. Nelson, James Timothy Macheras
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Jan 23, 2003
Inventors
Yong Ding
Benjamin Bikson
Joyce K. Nelson
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.