Granted Patent
Utility
US 4,822,437 · App. 07/157,751
Method and apparatus for making non-roping thermoplastic draw tape for thermoplastic bags
Inventors:
David A. Bryniarski, Edward G. Grosz
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Feb 19, 1988
Inventors
David A. Bryniarski
Edward G. Grosz
Assignee (at issue)
Mobil Oil 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.