Granted Patent
Utility
US 5,809,860 · App. 08/817,200
Methods for forming lines of weakening in closures
Inventor:
James D. Haaser
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Apr 11, 1997
Inventor
James D. Haaser
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.