| Number | Name | Date | Kind |
|---|---|---|---|
| D306640 | Kott | Mar 1990 | |
| D366516 | Stewart | Jan 1996 | |
| 3448862 | Kudaty | Jun 1969 | |
| 4560477 | Moldow | Dec 1985 | |
| 4735720 | Kersting | Apr 1988 | |
| 5211849 | Kott et al. | May 1993 | |
| 5531848 | Brinda et al. | Jul 1996 |
| Entry |
|---|
| Front cover of Pleatco's "Replacement Swimming Pool and Spa Filter Cartridge Catalog"; Date of Publication: 1991; Place of Publication United States. |
| Unicel's 1998 Replacement Guide (cover and pp. 1 and 71); date of Publication: unknown, but copyright notice indicates similar guides have been published since 1985; Place of Publication: United States. |