Granted Patent
Utility
US 4,210,257 · App. 06/050,647
Fracture and tear-resistant retained tab
Inventor:
Charles S. Radtke
Patented Case
View Patent ↗
Granted: Jul 1, 1980
Filed: Jun 21, 1979
Inventor
Charles S. Radtke
Assignee (at issue)
American Can Company
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.