Granted Patent
Utility
US 5,256,356 · App. 07/928,558
Method for forming an opening in a container
Inventor:
George A. Grimes
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Aug 11, 1992
Inventor
George A. Grimes
Assignee (at issue)
Dolco Packaging Corp.
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.