Granted Patent
Utility
US 4,814,014 · App. 06/939,647
Hydraulic cement additives and hydraulic cement compositions containing same
Inventor:
Ahmad Arfaei
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Dec 9, 1986
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.