Granted Patent
Utility
US 6,172,147 · App. 09/233,806
Additive for production of highly workable mortar cement
Inventors:
Angel Abelleira, John Scott Hallock
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: May 5, 1998
Inventors
Angel Abelleira
John Scott Hallock
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.