Granted Patent
Utility
US 4,355,421 · App. 06/213,204
Broadband mixer with coplanar balun
Inventor:
Warren L. Seely
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Dec 5, 1980
Inventor
Warren L. Seely
Assignee (at issue)
Vari-L Company, Inc.
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.