Granted Patent
Utility
US 6,541,177 · App. 09/835,651
Diffusion transfer photographic film unit
Inventors:
James A. Foley, Michael P. Filosa, Stephen J. Telfer, John Marshall, David P. Waller
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Apr 16, 2001
Inventors
James A. Foley
Michael P. Filosa
Stephen J. Telfer
John Marshall
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.