Granted Patent
Utility
US 5,311,997 · App. 07/988,393
Selective separation of finely-divided minerals by addition of selective collector reagent and centrifugation
Inventors:
George E. Gantt, Thomas J. Adkisson, Preston B. Gladin, Randall E. Ussery, Jr.
Patented Case
View Patent ↗
Granted: May 17, 1994
Filed: Dec 9, 1992
Inventors
George E. Gantt
Thomas J. Adkisson
Preston B. Gladin
Randall E. Ussery, Jr.
Assignee (at issue)
Engelhard 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.