Granted Patent
Utility
US 4,957,556 · App. 07/363,587
Very early setting ultra high early strength cement
Inventor:
Hassan Kunbargi
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Jun 8, 1989
Inventor
Hassan Kunbargi
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.