Granted Patent
Utility
US 4,793,522 · App. 07/061,777
Positive discharge valve for viscous product dispenser
Inventor:
Douglas F. Corsette
Patented Case
View Patent ↗
Granted: Dec 27, 1988
Filed: Jun 15, 1987
Inventor
Douglas F. Corsette
Assignee (at issue)
Calmar Holdings 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.