Quote Originally Posted by amuderick View Post
It appears that Fuji integral materials utilize Kodak methods and technology (expose from the rear, etc).
Here is a link: http://island.geocities.jp/sihohigari/jp/tip/fi800.html

The Instax line is similar in technology but different in size.
This reference indicates that the material made by Fuji can be used in a Kodak camera by modification of the pack (removing a tab) and using a neutral density filter to adjust for the speed difference in the Fuji product.

The Kodak chemistries (there were 2) involved heavily patented materials and the patents awarded to Kodak were not voided by the lawsuit.

One material required direct positive emulsions and the other used negative emulsions, metallized dyes and achieved a camera speed of ISO 3000. This latter product was never sold.