Granted Patent
Utility
US 4,887,795 · App. 07/867,895
Open-celled, electrically conductive ceramic network
Inventors:
Joseph Nemeth, Charles I. Kowalski
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: May 20, 1986
Inventors
Joseph Nemeth
Charles I. Kowalski
Assignee (at issue)
Champion Spark Plug Company
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.