Granted Patent
Utility
US 4,442,873 · App. 06/325,289
Container actuated counterpressure filling valve
Inventor:
Chung J. Yun
Patented Case
View Patent ↗
Granted: Apr 17, 1984
Filed: Nov 27, 1981
Inventor
Chung J. Yun
Assignee (at issue)
Crown, Cork & Seal Company, 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.