Granted Patent
Utility
US 4,568,855 · App. 06/475,170
Spark plug
Inventors:
Joseph Nemeth, Clifford C. McMahon, Daniel Lee Tribble
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Mar 14, 1983
Inventors
Joseph Nemeth
Clifford C. McMahon
Daniel Lee Tribble
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.