Granted Patent
Utility
US 6,809,146 · App. 10/165,159
Rubber mixtures containing silica, carbon black and rubber gel
Inventors:
Werner Obrecht, Anthony Sumner
Patented Case
View Patent ↗
Granted: Oct 26, 2004
Filed: Jun 7, 2002
Inventors
Werner Obrecht
Anthony Sumner
Assignee (at issue)
Bayer 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.