Granted Patent
Utility
US 6,620,856 · App. 09/869,039
Production of concentrated carbonate suspensions
Inventors:
Mark Mortimer, John Anthony Purdey, Deborah Thrale, David Robert Skuse
Patented Case
View Patent ↗
Granted: Sep 16, 2003
Filed: Nov 9, 2001
Inventors
Mark Mortimer
John Anthony Purdey
Deborah Thrale
David Robert Skuse
Assignee (at issue)
IMERYS MINERALS 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.