Granted Patent
Utility
US 6,119,743 · App. 08/832,542
Tire tread of butadiene copolymer, polybutadiene and aromatic oil
Inventor:
Walter Hellermann
Patented Case
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Granted: Sep 19, 2000
Filed: Apr 2, 1997
Inventor
Walter Hellermann
Assignee (at issue)
Huels Aktiengesellschaft
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.