Granted Patent
Utility
US 5,674,986 · App. 08/645,258
Photographically useful compounds including at least one 1,3-sulfur-oxygen ring system
Inventors:
Peter Viski, David P. Waller
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: May 13, 1996
Inventors
Peter Viski
David P. Waller
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.