I would assume there's some kind of either film or spray-on stuff that is used for each of the 4 primary printing colors. The part would need to either hold still or be repositioned after cleaning off the excess material between firings if that were the case. I suppose that's not too hard with the right fixturing though.
I just saw a patent application where there is a color printed sheet that gets transferred onto a surface using a laser, but it needed cooking in an oven for it to cure. I would assume that it's a different process than the one described here.
I have to assume that the people applying for the patent know that applications are viewable by the public.
ULS 135 watt w/rotary, Mazak QT-6T CNC lathe, Dapra machining center, Sherline CNC, Tormach CNC, Acad, Rofin welding laser, YAG laser w/ rotary, 4500 watt Fiber laser
Boone Titanium Rings