• 8,994,737

• 8,581,926

• 7,808,501

• 7,688,323

• 7,538,779

• 7,496,416

• 08/905,434 (US Patent No. 6,037,949)

• 08/905,435 (US Patent No. 6,222,553)

• 08/905,436 (US Patent No. 6,300,960)

• 09/756,112 (US Patent No. 6,489,960)

• 09/619,064 (US Patent No. 6,760,024)

• 10/686,551 (US Patent No. 7,023,438)

• 11/274,883 (US Patent No. 7,233,332)

• 10/810,064 (Publication No. 20040263511)