Granted Patent
Utility
US 4,666,573 · App. 06/869,554
Synthetic diaphragm and process of use thereof
Inventors:
Donald W. DuBois, Colonel R. Dilmore, W. Bruce Darlington
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Jun 2, 1986
Inventors
Donald W. DuBois
Colonel R. Dilmore
W. Bruce Darlington
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.