Granted Patent
Utility
US 5,215,583 · App. 07/894,538
Process for coloring building materials
Inventors:
Bernd Krockert, Gunter Linde
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jun 5, 1992
Inventors
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.