| Number | Name | Date | Kind |
|---|---|---|---|
| D224686 | Michlap et al. | Aug 1972 | |
| D254813 | Kossar | Apr 1980 | |
| 1582144 | Pflaum | Apr 1926 | |
| 2538778 | Halpin | Jan 1951 | |
| 2865329 | Elliott | Dec 1958 | |
| 2894487 | Goldson | Jul 1959 | |
| 2976841 | Scheffer | Mar 1961 | |
| 3156213 | Patten | Nov 1964 | |
| 3481311 | Schluttig | Dec 1969 | |
| 3482548 | Burns | Dec 1969 | |
| 3509855 | Priddy, Jr. | May 1970 | |
| 3850144 | Springer et al. | Nov 1974 | |
| 3934552 | Kulka | Jan 1976 | |
| 4220119 | Albright | Sep 1980 | |
| 4301766 | Piccone | Nov 1981 | |
| 4347807 | Reich | Sep 1982 | |
| 4484540 | Yamamoto | Nov 1984 | |
| 4576116 | Binkert | Mar 1986 | |
| 4644902 | Doyle | Feb 1987 | |
| 4729343 | Evans | Mar 1988 | |
| 4781147 | Delino, Jr. | Nov 1988 | |
| 4803951 | Davis | Feb 1989 | |
| 4852520 | Goetz | Aug 1989 | |
| 4907540 | Reynolds | Mar 1990 | |
| 4938169 | Barmakian | Jul 1990 | |
| 4977857 | Slawinski | Dec 1990 | |
| 4996946 | Olson | Mar 1991 | |
| 5038716 | Olson | Aug 1991 |
| Number | Date | Country |
|---|---|---|
| 2354727 | Jun 1976 | FRX |
| 2476461 | Feb 1980 | FRX |
| Entry |
|---|
| Lillian Vernon Catalog, vol. 304, printed 1993 (probably before Jun. 1, 1993), p. 51. |
| Zoroufy, Feline Resort.TM. Cat Playland, Feb. 1992. |
| "Kitt'n Gym", Cal-Pet Products 1986. |
| R. C. Steele, Wholesale Dog Equipment and Kennel Supplies, Spring 1993, pp. 4, 16, 58, 60. |
| 1994 Jeffers Pet Catalog, Nov. 17, 1993, p. 60. |