| Number | Name | Date | Kind |
|---|---|---|---|
| 3876322 | Deason | Apr 1975 | A |
| 4490067 | Dahowski | Dec 1984 | A |
| 4621939 | Thomann et al. | Nov 1986 | A |
| 4815888 | Stegmeier | Mar 1989 | A |
| 5340234 | Rossi et al. | Aug 1994 | A |
| D377389 | Phillips et al. | Jan 1997 | S |
| 5803662 | Gunter | Sep 1998 | A |
| 6000881 | Becker et al. | Dec 1999 | A |
| Entry |
|---|
| Quaker Plastic Corp.; product catalog, p. 11 (no date). |
| Mortex Mfg. Co., Inc.; Drain Rite brand promotional literature (no date). |
| D.F.C. Company; Deck-O-Drain Mark III(R) promotional literature (no date). |
| NDS; Micro Channel brand promotional literature. |