Granted Patent
Utility
US 5,141,802 · App. 07/655,256
Chemically treated shapes, fillers and reinforcement for polymer matrices
Inventors:
Luciano M. Parrinello, Narasimhan Raghupathi
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Feb 13, 1991
Inventors
Luciano M. Parrinello
Narasimhan Raghupathi
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.