Granted Patent
Utility
US 6,491,751 · App. 09/320,048
Method for manufacturing cement using a raw material mix including finely ground steel slag
Inventor:
Robert C. Watson
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: May 26, 1999
Inventor
Robert C. Watson
Assignee (at issue)
Texas 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.