Granted Patent
Utility
US 4,877,679 · App. 07/286,585
Multilayer article of microporous and porous materials
Inventors:
Dennis D. Leatherman, Thomas A. Rechlicz, Richard A. Schwarz
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Dec 19, 1988
Inventors
Dennis D. Leatherman
Thomas A. Rechlicz
Richard A. Schwarz
Assignee (at issue)
PPG Industries, 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.