| Number | Name | Date | Kind |
|---|---|---|---|
| 1543387 | Kawalle | Jun 1925 | A |
| 1836800 | Hope | Dec 1931 | A |
| 2614321 | Ackerman | Oct 1952 | A |
| 2839224 | Lipka | Jun 1958 | A |
| 3477127 | Regan | Nov 1969 | A |
| 3702026 | Scholin | Nov 1972 | A |
| 3703765 | Perez | Nov 1972 | A |
| 3969817 | DiBuono | Jul 1976 | A |
| 4074429 | Roberts | Feb 1978 | A |
| 4483068 | Clifford | Nov 1984 | A |
| 4562644 | Hitchens | Jan 1986 | A |
| 4595124 | Duval et al. | Jun 1986 | A |
| 4712300 | Hemmeter | Dec 1987 | A |
| 4893641 | Strickland | Jan 1990 | A |
| 4944090 | Sumnall | Jul 1990 | A |
| 4964214 | Welsh et al. | Oct 1990 | A |
| 4977670 | Iten | Dec 1990 | A |
| 4979298 | Pesiri | Dec 1990 | A |
| 4984365 | Leonard et al. | Jan 1991 | A |
| 5031318 | Brown et al. | Jul 1991 | A |
| 5121541 | Patrakis | Jun 1992 | A |
| 5134775 | Althaus et al. | Aug 1992 | A |
| 5141349 | Maguire, Jr. et al. | Aug 1992 | A |
| 5319852 | Metzger | Jun 1994 | A |
| 5461782 | Rauch | Oct 1995 | A |
| 5490329 | Chylinski et al. | Feb 1996 | A |
| 5493778 | Ichiyanagi | Feb 1996 | A |
| 5579580 | Althaus et al. | Dec 1996 | A |
| 5604983 | Simms et al. | Feb 1997 | A |
| 6161287 | Swanson et al. | Dec 2000 | A |
| 6185823 | Brown et al. | Feb 2001 | B1 |
| Number | Date | Country |
|---|---|---|
| 0276066 | Jan 1988 | EP |
| 1 125 697 | Aug 2001 | EP |
| Entry |
|---|
| Eurpoean Search Report EP 01300318 Dated May 23, 2001. |