DuPont is stepping up its attacks on the customers of its competitor Samsung SDI, alleging that by using Samsung SDI’s front-side metallization paste, they are infringing on DuPont’s own patented tellurium paste technology. DuPont is using legal channels to attempt to sever the ties between Samsung SDI and its customers, according to EnergyTrend, a subsidiary of Taiwan-based market intelligence firm TrendForce.