Granted Patent
Utility
US 6,641,661 · App. 09/979,773
High early strength cement and additives and methods for making the same
Inventors:
Leslie A. Jardine, Josephine H. Cheung, Walter M. Freitas
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Jan 30, 2002
Inventors
Leslie A. Jardine
Josephine H. Cheung
Walter M. Freitas
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.