Patent Numbers:
US7011478, US7018145, US7114893, US7241089, US7547166, CA2542814, CA2542815, MX253703, MX274690, EP1682294 (DE, FR, GB, IT), EP1682295 (DE, FR, GB, IT), KR100764140, KR100795598, CN100478107, CN100513027, CN101518834, CN101642823, IN227218, IN228015