Granted Patent
Utility
US 4,335,202 · App. 06/292,261
Tetraazaundecane and complexes as sensitizers for silver halide emulsion
Inventors:
Rolf Hengel, David F. Eaton
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Aug 12, 1981
Inventors
Rolf Hengel
David F. Eaton
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.