Granted Patent
Utility
US 5,494,515 · App. 08/404,902
Method and apparatus for using blast-furnace slag in cement clinker production
Inventor:
Rom D. Young
Patented Case
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Granted: Feb 27, 1996
Filed: Mar 15, 1995
Inventor
Rom D. Young
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.