Granted Patent
Utility
US 5,071,609 · App. 07/266,745
Process of manufacturing porous multi-expanded fluoropolymers
Inventors:
Roger Tu, Wilfred F. Mathewson, Mark A. Roberts
Patented Case
View Patent ↗
Granted: Dec 10, 1991
Filed: Nov 3, 1988
Inventors
Roger Tu
Wilfred F. Mathewson
Mark A. Roberts
Assignee (at issue)
Baxter International 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.