Granted Patent
Utility
US 5,449,774 · App. 07/678,482
Production of beta form pigmentary copper phthalocyanine
Inventors:
Ian A. Lambie, Michael McFarlane, Robert Langley
Patented Case
View Patent ↗
Granted: Sep 12, 1995
Filed: Apr 1, 1991
Inventors
Ian A. Lambie
Michael McFarlane
Robert Langley
Assignee (at issue)
Ciba-Geigy
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.