Parison whose neck is based on an aromatic polyester, and in particular on pet, the neck including a thread having a profile in longitudinal section that is asymmetrical

Granted: Oct 21, 2003 Filed: Apr 25, 2000

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.