Granted Patent
Utility
US 5,252,522 · App. 07/843,255
Purple pigments, a process for their production and use thereof
Inventors:
Bernd Dorbath, Karl-Anton Starz, Werner Voelker, Wilan Jerke, Kai Dorer
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Feb 28, 1992
Inventors
Bernd Dorbath
Karl-Anton Starz
Werner Voelker
Wilan Jerke
Kai Dorer
Assignee (at issue)
Degussa AG
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.