Not sure about patent on multi window, but it's not just Samsung as Irvgotti mentioned it's on the OPT-G as well. Saw that on a commercial and was hmm that might be nice, I'd looked at a note2 before going to DNA which had it, though I think there would be limited uses (but good ones when they applied). I think to use this feature a phone would need to have enough real-estate like the DNA/Note2, we'll see how many phones come along in ubersize this year and this feature may become more mainstream, I had thought someone at xda would have hacked this for the DNA but nada..