Granted Patent
Utility
US 4,884,620 · App. 07/262,386
Hot box process for preparing foundry shapes with certain aqueous phenolic resin solutions
Inventors:
Satish S. Jhaveri, William R. Dunnavant, Heimo J. Langer
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Oct 24, 1988
Inventors
Satish S. Jhaveri
William R. Dunnavant
Heimo J. Langer
Assignee (at issue)
Ashland Oil, 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.