| Number | Name | Date | Kind |
|---|---|---|---|
| 3659025 | Halleck | Apr 1972 | |
| 3915921 | Schlatzer, Jr. | Oct 1975 | |
| 4062817 | Westerman | Dec 1977 | |
| 4509949 | Huang et al. | Apr 1985 | |
| 5236710 | Guerrero et al. | Aug 1993 |
| Number | Date | Country |
|---|---|---|
| 2211192 | Jun 1989 | GBX |
| Entry |
|---|
| Harry's Cosmeticology, by Ralph G. Harry pp. 64-69 (1973). |