Granted Patent
Utility
US 5,834,064 · App. 08/831,526
Effect coatings whose perceived color depends on the viewing angle
Inventors:
Erwin Dietz, Axel Schonfeld, Willi Kreuder
Patented Case
View Patent ↗
Granted: Nov 10, 1998
Filed: Apr 1, 1997
Inventors
Erwin Dietz
Axel Schonfeld
Willi Kreuder
Assignee (at issue)
Hoechst GmbH
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.