Granted Patent
Utility
US 4,980,609 · App. 07/257,376
Spark gap purge system
Inventor:
William J. Thayer, III
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Oct 12, 1988
Inventor
William J. Thayer, III
Assignee (at issue)
Amoco Corporation
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.