Granted Patent
Utility
US 4,555,340 · App. 06/545,561
Excess overflow orifice tubes
Inventor:
William H. Boyle
Patented Case
View Patent ↗
Granted: Nov 26, 1985
Filed: Oct 26, 1983
Inventor
William H. Boyle
Assignee (at issue)
Envirex, Inc.
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.