Granted Patent
Utility
US 5,252,449 · App. 07/951,609
Photographic silver halide emulsions with improved bright room tolerance
Inventor:
John R. Shock
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Sep 25, 1992
Inventor
John R. Shock
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.