16. Mixed packet color with a single layer producing all colors of todays color papers. This had many problems yet to be solved, but was killed by slide coating and curtain coating. It would still be a big advance.
I have always been surprised (well, disappointed) that Kodak has not leveraged its experience in what everybody else these days calls nanotechnology. Perhaps those are the products that are going forward, and that is why we don't hear about them, but from my armchair viewpoint Kodak seem simply never to have realised that their skills in reliable bulk production of nanocrystals might be applicable elsewhere.
No. 16 is an example. If that trick can be pulled off there are a wealth of possible applications in optoelectronics. But not - yet - on the huge scale and in the traditional imaging markets that Kodak seems to cling to like a comfort blanket.
IBM has found ways to make money from its pure science research, even as its core business moved away from using that research in its own products. It would be good to see Kodak emulating that, both freeing up niche products from the dead hands of its accountants and putting fun new tools into the market.