Granted Patent
Utility
US 6,426,586 · App. 09/249,522
Contact glass composition for use in spark plugs
Inventors:
Ching T. Young, Philip R. Woodruff, Duane L. Schreiner, Harold E. Dunfee, Ralph Frederick, Jeff A. Goldacker
Patented Case
View Patent ↗
Granted: Jul 30, 2002
Filed: Feb 12, 1999
Inventors
Ching T. Young
Philip R. Woodruff
Duane L. Schreiner
Harold E. Dunfee
Ralph Frederick
Jeff A. Goldacker
Assignee (at issue)
AlliedSignal, 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.