Granted Patent
Utility
US 5,759,253 · App. 08/760,030
Lightweight aggregate and process for its production
Inventor:
Rom D. Young
Patented Case
View Patent ↗
Granted: Jun 2, 1998
Filed: Dec 4, 1996
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.