Granted Patent
Utility
US 6,258,180 · App. 09/322,611
Wear resistant ductile iron
Inventors:
Al Wilde, Dan Korpi, Brian Schultz
Patented Case
View Patent ↗
Granted: Jul 10, 2001
Filed: May 28, 1999
Inventors
Al Wilde
Dan Korpi
Brian Schultz
Assignee (at issue)
Waupaca Foundry, 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.