Coretec Group Inc (CRTG)

[rbairos]

I saw Elizabeth Downing's prototype at a graphics conference live, several years ago.
It consisted of a small one inch cube in which two mechanically positioned lasers created a dot, where ever their invisible beams crossed.

I tried looking up the company for info years after, but never found much.

The 'cube' behaviour itself is what is most similar to 3dicon.

I dont think there is any inherent computational complexity involved, except perhaps if you mean mechanically driving the lasers.
This all however, was before the advent of DLP's which can efficiently direct two 'sheets' of light, instead of a single intersecting point of light, which is very mechanical and slow.

I don't know if 3DIcon's use of DLP projectors is patentable.
I suspect 3DTL would have naturally moved onto that technology as it became available.

In the end, the core technology is the material itself.
Its not clear which company is in the lead in that regard.

As for the other companies previously listed, of the ones I recognized (felix, actuality, etc) they're simply variations on mechanically spinning screens.

Hope that helps,
Rob