Granted Patent
Utility
US 4,328,301 · App. 06/188,428
Stripping layers in diffusion transfer film
Inventor:
Peter J. Wright
Patented Case
View Patent ↗
Granted: May 4, 1982
Filed: Sep 18, 1980
Inventor
Peter J. Wright
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.