Granted Patent
Utility
US 4,430,439 · App. 06/457,345
Monolithic refractories
Inventor:
Thomas R. Kleeb
Patented Case
View Patent ↗
Granted: Feb 7, 1984
Filed: Jan 12, 1983
Inventor
Thomas R. Kleeb
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.