Granted Patent
Utility
US 4,836,970 · App. 07/123,325
Method of extrusion blow-molding container having upper and lower sections of different thickness
Inventor:
Edward S. Robbins, III
Patented Case
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Granted: Jun 6, 1989
Filed: Nov 20, 1987
Inventor
Edward S. Robbins, III
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.