Granted Patent
Utility
US 5,693,137 · App. 08/563,952
Use of alumina clay with cement fly ash mixtures
Inventor:
Robert W. Styron
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Nov 29, 1995
Inventor
Robert W. Styron
Assignee (at issue)
JTM 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.