| S. No. | Patent identifier |
|---|---|
| 1 | US5846990 |
| 2 | US20060063857A1 |
| 3 | US20060063857 |
| 4 | US5416100 |
| 5 | US20010019806 |
| 6 | JP2005300994 |
| 7 | US4585863 |
| 8 | JP2006039140A |
| 9 | US5811450 |
| 10 | JP2006039140 |
| 11 | US5541208 |
| 12 | US4555576 |
| 13 | US20010019806A1 |
| 14 | US4500321 |
| 15 | JP2005300994A |
| 16 | US4755534 |
