Granted Patent
Utility
US 4,288,027 · App. 06/077,382
Openable cardboard lid for extendable popcorn pans
Inventor:
David Peterson
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Sep 20, 1979
Inventor
David Peterson
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.