Patents:
This product is covered by one or more of the following patents:
US Pat. 5784584, 5809336, 5841424, 6438638, 6598148, 6832281, 6859361, 6859369
Taiwan Pat. I 222564
China Pat. CN 018152163
S. Korea Pat. KR 476817
Other Foreign & US Patents Pending
http://www.onspecinc.com/Quick_Data_Sheets/xSil_268_Quick_Data_Sheet.pdf