Granted Patent
Utility
US 4,594,087 · App. 06/718,609
Three-terminal controller for fiber glass bushing
Inventor:
John J. Kuhn
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Apr 1, 1985
Inventor
John J. Kuhn
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.