求美国杜邦专利

acgi/nph-Parser？section 1 = PTO 2 & amp；HITOFF & ampp=1。u = % 2 fnetahtml % 2fp to % 2f search-bool . html & amp；r = 3 & ampf = G & ampl=50英镑。co 1 = AND & amp；d = PTXT & amps1=6902802。OS = 6902802 & ampRS=6902802

直接看就行了。