Granted Patent
Utility
US 4,553,986 · App. 06/670,790
Filtering system and method of using same
Inventors:
David F. Ciliberti, Thomas E. Lippert
Patented Case
View Patent ↗
Granted: Nov 19, 1985
Filed: Nov 13, 1984
Inventors
David F. Ciliberti
Thomas E. Lippert
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.