Granted Patent
Utility
US 5,443,728 · App. 08/234,037
Method of preparing membranes from blends of polyetherimide and polyimide polymers
Inventors:
James Timothy Macheras, Benjamin Bikson, Joyce K. Nelson
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Apr 28, 1994
Inventors
James Timothy Macheras
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.