Granted Patent
Utility
US 5,067,639 · App. 07/621,995
Pouring spout which can be selectively opened and closed
Inventors:
Paul R. Maguire, John M. Lown
Patented Case
View Patent ↗
Granted: Nov 26, 1991
Filed: Dec 4, 1990
Inventors
Paul R. Maguire
John M. Lown
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.