Granted Patent
Utility
US 4,451,249 · App. 06/304,405
Manufacture of thermoplastic bags
Inventor:
Rene F. DeBin
Patented Case
View Patent ↗
Granted: May 29, 1984
Filed: Sep 21, 1981
Inventor
Rene F. DeBin
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.