Granted Patent
Utility
US 4,392,250 · App. 06/265,128
Symmetric microwave mixer
Inventor:
Ben R. Hallford
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: May 19, 1981
Inventor
Ben R. Hallford
Assignee (at issue)
Rockwell International 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.