Granted Patent
Utility
US 4,725,254 · App. 06/934,514
Method for manufacturing a center electrode for a spark plug
Inventors:
David J. Moore, William A. Barrett
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Nov 24, 1986
Inventors
David J. Moore
William A. Barrett
Assignee (at issue)
ALLIED CONSULTING, 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.