Granted Patent
Utility
US 5,840,772 · App. 08/715,603
Methods of recycling and compositions used therein
Inventors:
Donald S. Peters, Randall J. Brent
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Sep 18, 1996
Inventors
Donald S. Peters
Randall J. Brent
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.