Granted Patent
Utility
US 4,300,934 · App. 06/153,387
Method of and apparatus for scoring a coated substrate
Inventor:
Robert P. DeTorre
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: May 27, 1980
Inventor
Robert P. DeTorre
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.