The name on mine that I bought at a quilt show is Jean's Impressions Portable Lap Frame. It is the one with the 3 short spindles and the platform that sits on your lap. Her website is www.jeansimpressions.com
if you are interested in looking at one. It is nice because it holds the quilt off your lap. Mine is about 15 inches in diameter but I believe they have a 12 and 14" or something like that as well. It is nice for me because living in Southern California and hand quilting in the summer, the last thing you want is a quilt laying on your lap.