The clinchers indeed came from Ukai and the sew-ups were from Ambrosio. The trademark conflict Peter spoke of was with John Padget, builder of absolutely beautiful fillet brazed frames (Saturn) in Davis California.
John didn't build many frames but somehow he was hatched as a master of the fillet right out of the blocks. His trademark was a slightly ovalized top tube which he claimed let the frame flex a bit more vertically and increased lateral stiffness for cornering. As a graduate physics student, he had constructed jigs to test this theory and claimed he could back it up with hard numbers.
He was also making his own fillet brazed stems in he early 80's. His bikes are rarely seen outside of the bay area/Sacramento, but if you ever get a chance they are truly something to linger over. Too bad he is no longer in the business.
Bryant Bainbridge
Portland Orygun