Granted Patent
Utility
US 5,264,322 · App. 07/874,858
Sulfonated xanthene dyes, and photographic products and processes employing these dyes
Inventors:
Paul Carlier, Michael P. Filosa, Mary P. Lockshin
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Apr 28, 1992
Inventors
Paul Carlier
Michael P. Filosa
Mary P. Lockshin
Assignee (at issue)
Polaroid Corporation
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.