| Number | Date | Country | Kind |
|---|---|---|---|
| 2-65239 | Mar 1990 | JPX | |
| 2-65240 | Mar 1990 | JPX | |
| 2-65241 | Mar 1990 | JPX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3585046 | Schaible et al. | Jun 1971 |
| Number | Date | Country |
|---|---|---|
| 3617547 | Nov 1987 | DEX |
| Entry |
|---|
| Samuel A. Matz, Ph.D., Formulas and Processes for Bakers, Pan-Tech. International, Inc., 1987; pp. 40-56. |