Granted Patent
Utility
US 4,533,646 · App. 06/613,941
Nitride bonded oxide refractories
Inventors:
Ke-Chin Wang, Howard M. Winkelbauer
Patented Case
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Granted: Aug 6, 1985
Filed: May 24, 1984
Inventors
Ke-Chin Wang
Howard M. Winkelbauer
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.