Granted Patent
Utility
US 5,160,539 · App. 07/680,900
Method and product of fly ash benefication by carbon burnout in a dry bubbling fluid bed
Inventor:
Joseph W. Cochran
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Apr 5, 1991
Inventor
Joseph W. Cochran
Assignee (at issue)
Progress Materials, 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.