Granted Patent
Utility
US 4,798,574 · App. 07/130,618
Method of making a bag with a barrier material
Inventor:
Ronald Marsik
Patented Case
View Patent ↗
Granted: Jan 17, 1989
Filed: Dec 9, 1987
Inventor
Ronald Marsik
Assignee (at issue)
Bagcraft Corporation of America
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.