Granted Patent
Utility
US 4,260,099 · App. 06/091,822
Expandable paperboard cup and blank therefor
Inventor:
Duane R. Mode
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: Nov 6, 1979
Inventor
Duane R. Mode
Assignee (at issue)
Champion International Corporation Limited
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.