Granted Patent
Utility
US 4,711,653 · App. 06/947,253
Innovative press bending of thermoplastic sheets
Inventors:
Robert G. Frank, George R. Claassen, Thomas L. Waterloo, Stephen J. Schultz, Michael T. Fecik
Patented Case
View Patent ↗
Granted: Dec 8, 1987
Filed: Dec 29, 1986
Inventors
Robert G. Frank
George R. Claassen
Thomas L. Waterloo
Stephen J. Schultz
Michael T. Fecik
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.