| Number | Name | Date | Kind |
|---|---|---|---|
| 3397700 | Harlow et al. | Aug 1968 | |
| 3738375 | Doumas | Jun 1973 | |
| 4119105 | Owens | Oct 1978 | |
| 4874004 | Borowski et al. | Oct 1989 | |
| 4924886 | Litzinger | May 1990 | |
| 5115823 | Keritsis | May 1992 |
| Number | Date | Country |
|---|---|---|
| 1579891 | Aug 1969 | FRX |
| Entry |
|---|
| Leffingwill et al., Tobacco Flavoring for Smoking Products, RJ Reynolds Tobacco Co. 1972, pp. 63-64. |