Granted Patent
Utility
US 4,356,837 · App. 06/151,859
Self-cleaning orifice assembly
Inventor:
John Dickinson
Patented Case
View Patent ↗
Granted: Nov 2, 1982
Filed: May 21, 1980
Inventor
John Dickinson
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.