These products are protected by the following U.S. utility patents or foreign equivalents:
- US 5,675,515
- US 5,724,128
- US 5,870,315
- US 6,064,750
- US 6,134,792
- US 6,219,134
- US 6,252,973
- US 6,298,284
- US 6,427,346
- US 6,498,959
- US 6,796,036
Additional patents may be pending in the United States and elsewhere.
Revised: July 28, 2015