Granted Patent
Utility
US 4,792,578 · App. 06/919,352
Resin-bonded taphole mix
Inventors:
Gustav O. Hughes, George H. Criss
Patented Case
View Patent ↗
Granted: Dec 20, 1988
Filed: Oct 16, 1986
Inventors
Gustav O. Hughes
George H. Criss
Assignee (at issue)
Dresser 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.