Granted Patent
Utility
US 4,913,217 · App. 07/300,125
Locators for expendable core in die casting die
Inventors:
Byron W. Koch, John J. McGarigal, R. Matthew Thomas
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Jan 23, 1989
Inventors
Byron W. Koch
John J. McGarigal
R. Matthew Thomas
Assignee (at issue)
Farley, 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.