Granted Patent
Utility
US 5,486,274 · App. 08/344,682
Poly-substituted phthalocyanines
Inventors:
Dean Thetford, Peter Gregory
Patented Case
View Patent ↗
Granted: Jan 23, 1996
Filed: Nov 17, 1994
Inventors
Dean Thetford
Peter Gregory
Assignee (at issue)
Zeneca Limited
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.