| Number | Name | Date | Kind |
|---|---|---|---|
| 3850433 | Purlia | Nov 1974 | A |
| 5317683 | Hager et al. | May 1994 | A |
| 5473732 | Chang | Dec 1995 | A |
| 5754840 | Rivette et al. | May 1998 | A |
| 5796395 | Hond | Aug 1998 | A |
| 5991751 | Rivette et al. | Nov 1999 | A |
| 5991780 | Rivette et al. | Nov 1999 | A |
| 5999907 | Donner | Dec 1999 | A |
| 6018714 | Risen, Jr. et al. | Jan 2000 | A |
| 6049811 | Petruzzi et al. | Apr 2000 | A |
| 6112181 | Shear et al. | Aug 2000 | A |
| 6151581 | Kraftson et al. | Nov 2000 | A |
| 6189029 | Fuerst | Feb 2001 | B1 |
| Entry |
|---|
| PCT-International Search Report dtd Jun. 13, 2001 (2 pages). |