Granted Patent
Utility
US 4,674,002 · App. 06/849,245
Directional comparison blocking system
Inventors:
Hung J. Li, John D. McFall
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: Apr 8, 1986
Inventors
Hung J. Li
John D. McFall
Assignee (at issue)
Westinghouse Electric Company LLC
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.