Granted Patent
Utility
US 5,693,692 · App. 08/240,599
Depressant for flotation separation of polymetallic sulphide ores
Inventors:
Srdjan Bulatovic, Tim M. Jessup, James F. Jackson, Gordon Leighton
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: May 9, 1994
Inventors
Srdjan Bulatovic
Tim M. Jessup
James F. Jackson
Gordon Leighton
Assignees (at issue)
HUNTSMAN PETROCHEMICAL LLC
Falconbridge 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.