Granted Patent
Utility
US 6,186,933 · App. 09/257,843
Plastic bag manufacturing process
Inventor:
Robert B. DeMatteis
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Feb 25, 1999
Inventor
Robert B. DeMatteis
Assignee (at issue)
Bob DeMatteis Co.
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.