Granted Patent
Utility
US 4,489,880 · App. 06/493,881
Tapered cup package
Inventor:
Rodney K. Calvert
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: May 12, 1983
Inventor
Rodney K. Calvert
Assignee (at issue)
The Mead 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.