Granted Patent
Utility
US 4,601,409 · App. 06/672,798
Liquid chemical dispensing system
Inventor:
Joseph A. DiRegolo
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Nov 19, 1984
Inventor
Joseph A. DiRegolo
Assignee (at issue)
Tri-Tec Industries Ltd.
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.