Granted Patent
Utility
US 6,224,664 · App. 09/100,199
Mixture comprising pigments having a liquid-crystalline structure with a chiral phase and its use
Inventors:
Christoph Muller-Rees, Eckhard Hanelt, Franz-Heinrich Kreuzer, Jurgen Kupfer, Horst Leigeber
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Jun 18, 1998
Inventors
Christoph Muller-Rees
Eckhard Hanelt
Franz-Heinrich Kreuzer
Jurgen Kupfer
Horst Leigeber
Assignee (at issue)
WACKER CHEMIE 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.