Granted Patent
Utility
US 5,931,331 · App. 08/805,204
Easy-open mechanism for can end
Inventors:
William A. Kirk, Michael C. Calhoun, David M. Hoffman, Jeffrey A. McFarland
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: Feb 27, 1997
Inventors
William A. Kirk
Michael C. Calhoun
David M. Hoffman
Jeffrey A. McFarland
Assignee (at issue)
Crown Cork & Seal Technologies 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.