Granted Patent
Utility
US 4,308,164 · App. 06/175,002
Novel yellow azo dyes and dichroic liquid crystal composition made therewith
Inventors:
Siegfried Aftergut, Herbert S. Cole, Jr.
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Aug 4, 1980
Inventors
Siegfried Aftergut
Herbert S. Cole, Jr.
Assignee (at issue)
General Electric Company
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.