Granted Patent
Utility
US 4,380,447 · App. 06/186,416
Method of closing an open end of a tube or tubular container
Inventor:
Thomas VanderLugt, Jr.
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Sep 12, 1980
Inventor
Thomas VanderLugt, Jr.
Assignee (at issue)
JAMES RIVER CORPORATION OF VIRGINIA
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.