Granted Patent
Utility
US 4,287,092 · App. 06/117,251
Acid catalysis of resin foundry binders
Inventors:
Patrick H. Stewart, Wayne D. Woodson
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Jan 31, 1980
Inventors
Patrick H. Stewart
Wayne D. Woodson
Assignee (at issue)
C.L. Industries, 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.