Granted Patent
Utility
US 4,274,866 · App. 06/091,077
Flotation and sintering of synthetic manganese carbonate
Inventors:
Ralph W. M. Lai, Edwin L. Owen
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Nov 5, 1979
Inventors
Ralph W. M. Lai
Edwin L. Owen
Assignee (at issue)
Kennecott Copper 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.