Granted Patent
Utility
US 4,588,392 · App. 06/725,975
Method of forming a thermoplastic film sack having a stress relieved bottom gusset seal line
Inventor:
Robert T. Maddock
Patented Case
View Patent ↗
Granted: May 13, 1986
Filed: Apr 22, 1985
Inventor
Robert T. Maddock
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.