Granted Patent
Utility
US 5,811,543 · App. 08/677,486
Fluorescent carbamate-modified phthalocyanine pigments
Inventors:
Zhimin Hao, John S. Zambounis, Abul Iqbal
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Jul 9, 1996
Inventors
Zhimin Hao
John S. Zambounis
Abul Iqbal
Assignee (at issue)
Ciba Speciality Chemicals Corp.
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.