| Number | Name | Date | Kind |
|---|---|---|---|
| 2871126 | Smith et al. | Jan 1959 | |
| 3492129 | Carswell et al. | Jan 1970 | |
| 3932680 | Egli et al. | Jan 1976 | |
| 4022914 | Moody | May 1977 | |
| 4362749 | Sozzi | Dec 1982 | |
| 4366174 | Kneubuehl et al. | Dec 1982 |
| Number | Date | Country |
|---|---|---|
| 1141950 | Feb 1969 | GBX |
| Entry |
|---|
| Webb et al., Byproducts from Milk, 1970, AVI Publ. Co., pp. 37-40. |