Granted Patent
Utility
US 5,607,986 · App. 08/423,599
Heat cured foundry mixes and their use
Inventors:
Young D. Kim, A. Leonard Haugse
Patented Case
View Patent ↗
Granted: Mar 4, 1997
Filed: Apr 17, 1995
Inventors
Young D. Kim
A. Leonard Haugse
Assignee (at issue)
Ashland, 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.