Granted Patent
Utility
US 5,481,231 · App. 08/262,811
Lumped element four port coupler
Inventors:
Michael Dydyk, Craig E. Lindberg
Patented Case
View Patent ↗
Granted: Jan 2, 1996
Filed: Jun 21, 1994
Inventors
Michael Dydyk
Craig E. Lindberg
Assignee (at issue)
Motorola, 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.