Granted Patent
Utility
US 5,822,851 · App. 08/775,305
Method of producing a ceramic package main body
Inventors:
Kozo Yamasaki, Naomiki Kato
Patented Case
View Patent ↗
Granted: Oct 20, 1998
Filed: Dec 31, 1996
Inventors
Kozo Yamasaki
Naomiki Kato
Assignee (at issue)
NGK SPARK PLUG CO., LTD.
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.