Granted Patent
Utility
US 6,464,749 · App. 09/497,853
Fe-based sintered valve seat having high strength and method for producing the same
Inventors:
Kinya Kawase, Koichiro Morimoto
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: Feb 4, 2000
Inventors
Kinya Kawase
Koichiro Morimoto
Assignee (at issue)
MITSUBISHI MATERIALS CORPORATION
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.