He,he..actually I think I know why your asking, becuase you want to know if there is such a thing as a maj or min 9, 11, or 13th interval. I don't know, I always refer to intervals larger than an octave as being sharp or flatted, as does most people. I checked in my theory book and it made no reference to labeling intervals larger then an octave as maj. or min. Griphon might know. Sorry, you stumped me on this one.

I can tell you that the 9th interval is equivalent to a maj. 2nd, the 11th a P4th, and the 13th a maj. 6th., but I'm sure you allready know that.