Granted Patent
Utility
US 4,680,279 · App. 06/832,915
Abrasion resistant refractory composition
Inventor:
Thomas R. Kleeb
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Feb 24, 1986
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.