Granted Patent
Utility
US 6,436,338 · App. 09/583,811
Iron-based alloy for internal combustion engine valve seat inserts
Inventor:
Cong Yue Qiao
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: May 30, 2000
Inventor
Cong Yue Qiao
Assignee (at issue)
L.E. Jones Company
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.