| Number | Name | Date | Kind |
|---|---|---|---|
| 3914957 | Jacobs | Oct 1975 | A |
| 4162029 | Gottsegen et al. | Jul 1979 | A |
| 4164853 | McDonough | Aug 1979 | A |
| 4249392 | Hotta | Feb 1981 | A |
| 4577475 | Herrera | Mar 1986 | A |
| 5222631 | Hood | Jun 1993 | A |
| 5407218 | Jackson | Apr 1995 | A |
| 5626353 | Campbell | May 1997 | A |
| 5730282 | Bureau | Mar 1998 | A |
| 5803472 | Lien | Sep 1998 | A |
| 5860281 | Coffee et al. | Jan 1999 | A |
| 6109059 | Lebrun | Aug 2000 | A |
| 6131925 | Weldon | Oct 2000 | A |
| Number | Date | Country |
|---|---|---|
| 0 56775 | Jul 1982 | EP |
| Entry |
|---|
| PCT International Search Report Dated Jun. 14, 2001. |