Granted Patent
Utility
US 5,635,067 · App. 08/404,208
Fluid separation membranes prepared from blends of polyimide polymers
Inventor:
James Timothy Macheras
Patented Case
View Patent ↗
Granted: Jun 3, 1997
Filed: Mar 14, 1995
Inventor
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.