| S. No. | Patent identifier |
|---|---|
| 1 | US5428056 |
| 2 | EP81303497 |
| 3 | US5143921 |
| 4 | US5100872 |
| 5 | EP87305662A2 |
| 6 | EP97107263A1 |
| 7 | US20080051451 |
| 8 | EP81303497B1 |
| 9 | US4962242 |
| 10 | JP2010521412 |
| 11 | EP97107263 |
| 12 | EP93918835B1 |
| 13 | JP2010521412T |
| 14 | EP110236A2 |
| 15 | US4946857 |
| 16 | US20080051451A1 |
| 17 | US5284850 |
| 18 | EP87305662 |
| 19 | EP93918835 |
