Granted Patent
Utility
US 5,608,053 · App. 08/548,175
Poly-substituted phthalocyanines
Inventors:
Dean Thetford, Peter Gregory
Patented Case
View Patent ↗
Granted: Mar 4, 1997
Filed: Oct 25, 1995
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.