Granted Patent
Utility
US 4,960,465 · App. 07/121,898
Hydraulic cement additives and hydraulic cement compositions containing same
Inventor:
Ahmad Arfaei
Patented Case
View Patent ↗
Granted: Oct 2, 1990
Filed: Nov 23, 1987
Inventor
Ahmad Arfaei
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.