Granted Patent
Utility
US 5,962,828 · App. 08/950,645
Enhanced flotation reagents for beneficiation of phosphate ores
Inventor:
Craig V. Hughes
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Oct 15, 1997
Inventor
Craig V. Hughes
Assignee (at issue)
Custom Chemicals Corporation
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.