Granted Patent
Utility
US 6,027,439 · App. 09/027,245
Two-piece paperboard lids having spiral-wound side wall and non-circular geometries, and methods of making the same
Inventors:
Charles E. Busse, Edward M. Earnest, David W. Norwood
Patented Case
View Patent ↗
Granted: Feb 22, 2000
Filed: Feb 23, 1998
Inventors
Charles E. Busse
Edward M. Earnest
David W. Norwood
Assignee (at issue)
Sweetheart Cup Company Inc.
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.