Granted Patent
Utility
US 5,759,254 · App. 08/683,445
Substituted phthalocyanines
Inventors:
Ian Alexander Macpherson, Iain Frank Fraser, Sharon Kathleen Wilson
Patented Case
View Patent ↗
Granted: Jun 2, 1998
Filed: Jul 18, 1996
Inventors
Ian Alexander Macpherson
Iain Frank Fraser
Sharon Kathleen Wilson
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.