Granted Patent
Utility
US 4,290,814 · App. 06/067,582
High alumina brick
Inventors:
Stanley R. Pavlica, Donald O. McCreight
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Aug 17, 1979
Inventors
Stanley R. Pavlica
Donald O. McCreight
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.