Granted Patent
Utility
US 5,664,699 · App. 08/416,565
Core sand preparation apparatus
Inventors:
David O. Kennedy, Anthony J. Beyer
Patented Case
View Patent ↗
Granted: Sep 9, 1997
Filed: Apr 4, 1995
Inventors
David O. Kennedy
Anthony J. Beyer
Assignee (at issue)
Simpson Technologies Corporation
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.