Granted Patent
Utility
US 4,386,149 · App. 06/235,352
Process for the production of photographic images by dye diffusion transfer and photographic material suitable in this process
Inventors:
Leslie F. A. Mason, Rainer Kitzing, Brian R. D. Whitear, William E. Long, Glenn Wood, David L. R. Reeves
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Feb 13, 1981
Inventors
Leslie F. A. Mason
Rainer Kitzing
Brian R. D. Whitear
William E. Long
Glenn Wood
David L. R. Reeves
Assignee (at issue)
Ciba-Geigy
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.