Granted Patent
Utility
US 5,340,689 · App. 08/058,494
Image-recording materials with cyclic 1,3-sulfur-nitrogen dye providing compounds
Inventors:
Efthimios Chinoporos, Robert H. Pauze, David P. Waller, David C. Whritenour
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: May 6, 1993
Inventors
Efthimios Chinoporos
Robert H. Pauze
David P. Waller
David C. Whritenour
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.