Granted Patent
Utility
US 5,002,908 · App. 07/428,965
Resin bonded refractory shape and method of making
Inventor:
Nicholas Cassens, Jr.
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: Oct 30, 1989
Inventor
Nicholas Cassens, Jr.
Assignee (at issue)
National Refractories & Minerals Corporation
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.