Granted Patent
Utility
US 6,687,189 · App. 10/114,862
High efficiency long lifetime sparker sources
Inventors:
Raymond B. Schaefer, John Gallagher
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: Apr 2, 2002
Inventors
Raymond B. Schaefer
John Gallagher
Assignee (at issue)
Phoenix Science & Technology, 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.