Granted Patent
Utility
US 5,674,449 · App. 08/450,262
Iron base alloys for internal combustion engine valve seat inserts, and the like
Inventors:
Xuecheng Liang, Gary R. Strong
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: May 25, 1995
Inventors
Xuecheng Liang
Gary R. Strong
Assignee (at issue)
Winsert, 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.