Granted Patent
Utility
US 5,322,563 · App. 08/085,628
Process for coloring building materials
Inventors:
Karl-Heinz van Bonn, Bernd Krockert, Gunter Linde
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: Jul 6, 1993
Inventors
Karl-Heinz van Bonn
Bernd Krockert
Gunter Linde
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.