Granted Patent
Utility
US 5,948,157 · App. 08/763,088
Surface treated additive for portland cement concrete
Inventors:
Colin J. McKenney, Mikhail Pildysh, Donald J. Shyluk
Patented Case
View Patent ↗
Granted: Sep 7, 1999
Filed: Dec 10, 1996
Inventors
Colin J. McKenney
Mikhail Pildysh
Donald J. Shyluk
Assignee (at issue)
Fording Coal Limited
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.