U.S. Patent No.
5995083; 5781181; 6124845; 6681268; 6983336; 6574095; 6037929; 5896127; 5869790; 6479775;

Japan Patent No.
3176475; 3734936; 3736768;

EP(UK) Patent No.
1016952; 2319591;

Germany Patent No.
69920646.4;

Taiwan Patent No.
105876; 0138274;