Granted Patent
Utility
US 4,529,648 · App. 06/229,220
Method of applying interleaving material to glass sheets
Inventors:
Paul F. Duffer, Joseph D. Kelly, Helmut Franz
Patented Case
View Patent ↗
Granted: Jul 16, 1985
Filed: Jan 28, 1981
Inventors
Paul F. Duffer
Joseph D. Kelly
Helmut Franz
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.