Granted Patent
Utility
US 4,902,423 · App. 07/305,839
Highly air permeable expanded polytetrafluoroethylene membranes and process for making them
Inventor:
John E. Bacino
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Feb 2, 1989
Inventor
John E. Bacino
Assignee (at issue)
W. L. Gore & Associates, 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.