Granted Patent
Utility
US 4,997,416 · App. 07/533,620
Method of making a stand-up plastic bag
Inventors:
David W. Mitchell, Roger D. Vrooman
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Jun 5, 1990
Inventors
David W. Mitchell
Roger D. Vrooman
Assignee (at issue)
Dow Brands Inc.
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.