Granted Patent
Utility
US 4,663,231 · App. 06/865,596
Flexible, chemically treated fibers and coated fabrics thereof
Inventors:
Mikhail M. Girgis, Ernest L. Lawton
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: May 22, 1986
Inventors
Mikhail M. Girgis
Ernest L. Lawton
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.