Granted Patent
Utility
US 5,857,253 · App. 08/618,710
System and methods for forming bushing plates
Inventor:
Mark DeLong
Patented Case
View Patent ↗
Granted: Jan 12, 1999
Filed: Mar 20, 1996
Inventor
Mark DeLong
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.