| Number | Name | Date | Kind |
|---|---|---|---|
| 4753661 | Nelson et al. | Jun 1988 | A |
| 5087151 | DiTullio | Feb 1992 | A |
| D329684 | Gray | Sep 1992 | S |
| 5511903 | Nichols et al. | Apr 1996 | A |
| 5556231 | Sidaway et al. | Sep 1996 | A |
| 5588778 | Nichols et al. | Dec 1996 | A |
| 6076993 | Gray | Jun 2000 | A |
| 6270287 | Gray | Aug 2001 | B1 |
| Entry |
|---|
| Undated drawing in Applicant's possession of a prior art leaching chamber. |