Granted Patent
Utility
US 5,740,528 · App. 08/449,158
Planar triply-balanced microstrip mixer
Inventor:
William J. Drennen, III
Patented Case
View Patent ↗
Granted: Apr 14, 1998
Filed: May 24, 1995
Inventor
William J. Drennen, III
Assignee (at issue)
Tracor Aerospace Electronic Systems, 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.