Granted Patent
Utility
US 4,513,889 · App. 06/452,953
Reclosable valve with removable hermetic external seal means
Inventor:
Walter C. Beard
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: Dec 27, 1982
Inventor
Walter C. Beard
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.