Granted Patent
Utility
US 5,225,847 · App. 07/652,397
Automatic antenna tuning system
Inventors:
David A. Roberts, Brian T. DeWitt
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Feb 7, 1991
Inventors
David A. Roberts
Brian T. DeWitt
Assignee (at issue)
Antenna Research Associates, 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.