Granted Patent
Utility
US 6,204,594 · App. 09/096,182
Spark plug with pressure sensor
Inventor:
Robert Scott Ingham
Patented Case
View Patent ↗
Granted: Mar 20, 2001
Filed: Jun 12, 1998
Inventor
Robert Scott Ingham
Assignee (at issue)
Cooper Automotive Products, 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.