Granted Patent
Utility
US 4,661,139 · App. 06/807,088
Vacuum pressing of glass doublets
Inventors:
Thomas J. Reese, John J. Ewing, Michael T. Fecik, Robert G. Frank, Terry A. Bennett
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Dec 10, 1985
Inventors
Thomas J. Reese
John J. Ewing
Michael T. Fecik
Robert G. Frank
Terry A. Bennett
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.