Granted Patent
Utility
US 4,351,095 · App. 06/045,974
Method of making spark plugs
Inventor:
Michael Davies
Patented Case
View Patent ↗
Granted: Sep 28, 1982
Filed: Jun 6, 1979
Inventor
Michael Davies
Assignee (at issue)
United Kingdom Atomic Energy Authority
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.