Granted Patent
Utility
US 4,448,322 · App. 06/083,870
Metal container end
Inventor:
John L. Kraska
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Oct 11, 1979
Inventor
John L. Kraska
Assignee (at issue)
National Crane Corporation
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.