Granted Patent
Utility
US 4,336,069 · App. 06/235,190
High strength aggregate for concrete
Inventors:
Vance H. Dodson, Lawrence R. Roberts
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Feb 17, 1981
Inventors
Vance H. Dodson
Lawrence R. Roberts
Assignee (at issue)
W. R. Grace & Co.
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.