Granted Patent
Utility
US 4,359,517 · App. 06/259,102
Diffusion transfer products with two timing layers for production of transparencies
Inventor:
Gerard Bourgeois
Patented Case
View Patent ↗
Granted: Nov 16, 1982
Filed: Apr 30, 1981
Inventor
Gerard Bourgeois
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.