Granted Patent
Utility
US 4,293,343 · App. 06/093,770
Mortars and cements having improved freeze-thaw properties and method of achieving same
Inventor:
Richard F. Shannon
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Nov 13, 1979
Inventor
Richard F. Shannon
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.