Granted Patent
Utility
US 5,256,452 · App. 07/976,062
One package stable etch resistant coating process
Inventors:
Susan U. McMonigal, Debra L. Singer, Dennis A. Simpson, Joseph A. Klanica, Michael A. Mayo
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Nov 13, 1992
Inventors
Susan U. McMonigal
Debra L. Singer
Dennis A. Simpson
Joseph A. Klanica
Michael A. Mayo
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.