Granted Patent
Utility
US 5,693,712 · App. 08/564,835
Silica filled rubbery vulcanizates
Inventors:
Paul Carl Urban, Walter Von Hellens
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Nov 29, 1995
Inventors
Paul Carl Urban
Walter Von Hellens
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.