Granted Patent
Utility
US 4,882,588 · App. 07/271,401
Steerable beam antenna system using butler matrix
Inventors:
Kenneth H. Renshaw, Timothy Allen Murphy
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Nov 14, 1988
Inventors
Kenneth H. Renshaw
Timothy Allen Murphy
Assignee (at issue)
Hughes Aircraft Company
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.