| S. No. | Patent identifier |
|---|---|
| 1 | US20200338225A1 |
| 2 | US5254708 |
| 3 | US8871967B2 |
| 4 | US4818442A |
| 5 | US4269780A |
| 6 | EP2496548B1 |
| 7 | EP0057736A1 |
| 8 | US11684689B2 |
| 9 | US20120195844A1 |
| 10 | EP0057736B1 |
| 11 | US6106908 |
| 12 | US6333082 |
| 13 | EP97919177 |
| 14 | WO2011055251A1 |
| 15 | EP97919177B1 |
| 16 | EP2496548A1 |
