Granted Patent
Utility
US 4,299,269 · App. 05/688,140
Handling system for foundry sand molds
Inventors:
Wilmer J. Friesen, Frank A. Hulet
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: May 20, 1976
Inventors
Wilmer J. Friesen
Frank A. Hulet
Assignee (at issue)
Grede Foundries, 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.