May be covered under one or more of the following U.S. patents:
4,797,916 5,426,690 5,434,905 5,491,745 5,493,605 5,533,010 5,574,727 5,581,598
5,650,790 5,660,269 5,661,780 5,663,981 5,671,248 5,696,471 5,717,312 5,732,355
5,754,407 5,758,289 5,768,345 5,787,356 5,794,152 5,801,466 5,825,161 5,864,619
5,893,034 5,912,968 5,915,227 5,929,598 5,930,720 5,960,358 5,987,330 6,044,281
6,070,082 6,125,277 6,253,088 6,314,278 6,418,209
6,618,015 6,671,315 6,714,630
6,782,098 6,788,920
6,788,953 6,839,550 6,889,184 6,901,271 6,907,094 6,914,940
6,953,118 7,023,176 7,030,819 7,146,160 7,203,307 7,206,403
Other patents pending.
