Granted Patent
Utility
US 4,348,287 · App. 06/266,775
Zirconium compounds as flotation aid
Inventor:
Fred W. Jenkins
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: May 26, 1981
Inventor
Fred W. Jenkins
Assignee (at issue)
Petrolite 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.