Granted Patent
Utility
US 4,771,209 · App. 06/592,288
Spark igniter having precious metal ground electrode inserts
Inventor:
Nolan Ryan
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Mar 22, 1984
Inventor
Nolan Ryan
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.