Granted Patent
Utility
US 4,931,075 · App. 07/390,054
High current multiterminal bushing controller
Inventor:
John J. Kuhn
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Aug 7, 1989
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.