Granted Patent
Utility
US 5,605,950 · App. 08/531,680
Tire tread composition comprising highly reinforcing reinforced amorphous precipitated silica
Inventors:
Larry R. Evans, Walter H. Waddell, Thomas G. Krivak
Patented Case
View Patent ↗
Granted: Feb 25, 1997
Filed: Sep 21, 1995
Inventors
Larry R. Evans
Walter H. Waddell
Thomas G. Krivak
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.