Granted Patent
Utility
US 6,583,538 · App. 09/690,887
Spark plug
Inventors:
Manfred Adolf, Werner Niessner
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Oct 18, 2000
Inventors
Manfred Adolf
Werner Niessner
Assignee (at issue)
BERU Aktiengesellschaft
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.