Granted Patent
Utility
US 6,258,161 · App. 09/408,255
Masonry blocks and masonry concrete admixture for improved freeze-thaw durability
Inventors:
Awdhoot Vasant Kerkar, Craig T. Walloch, Kati Hazrati
Patented Case
View Patent ↗
Granted: Jul 10, 2001
Filed: Sep 29, 1999
Inventors
Awdhoot Vasant Kerkar
Craig T. Walloch
Kati Hazrati
Assignee (at issue)
W.R. Grace & Co. Conn.
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.