Granted Patent
Utility
US 4,780,694 · App. 07/124,328
Directional filter system
Inventors:
Rolf Kich, Paul J. Tatomir, Martin B. Hammond
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Nov 23, 1987
Inventors
Rolf Kich
Paul J. Tatomir
Martin B. Hammond
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.