| Number | Name | Date | Kind |
|---|---|---|---|
| 2794663 | Grodt et al. | Jun 1957 | A |
| 3334933 | Ehlers | Aug 1967 | A |
| 4234220 | Finch et al. | Nov 1980 | A |
| 4290281 | Knaack et al. | Sep 1981 | A |
| 4307904 | Daus | Dec 1981 | A |
| 4437692 | Halopoff | Mar 1984 | A |
| 4613175 | Nelson | Sep 1986 | A |
| 4630750 | Hughes | Dec 1986 | A |
| 4643469 | Johnston et al. | Feb 1987 | A |
| 4655487 | Korn et al. | Apr 1987 | A |
| 4883294 | Goodspeed | Nov 1989 | A |
| 4911486 | Anderson | Mar 1990 | A |
| 4977763 | Sewell | Dec 1990 | A |
| 5076078 | Weger, Jr. | Dec 1991 | A |
| 5235830 | Benge | Aug 1993 | A |
| 5308126 | Weger, Jr. et al. | May 1994 | A |
| 5477710 | Stefanutti | Dec 1995 | A |
| 5875948 | Sadler | Mar 1999 | A |
| 6351975 | Valdes | Mar 2002 | B1 |
| 6439008 | Keil | Aug 2002 | B1 |
| 6494064 | Pena | Dec 2002 | B1 |
| 6578398 | Behunin | Jun 2003 | B2 |
| Entry |
|---|
| International Search Report from International Application No. PCT/US01/50422, dated Apr. 19, 2002. |
| Number | Date | Country | |
|---|---|---|---|
| 60/244472 | Oct 2000 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10/001345 | Oct 2001 | US |
| Child | 10/606986 | US |