Granted Patent
Utility
US 4,238,342 · App. 06/057,140
Process of making shaped article of lithium ferrite containing phosphorus pentoxide with vanadium pentoxide or bismuth trioxide sintering agents
Inventors:
Ho Bin Im, Donald G. Wickham
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jul 12, 1979
Inventors
Ho Bin Im
Donald G. Wickham
Assignee (at issue)
Ampex 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.