Number | Date | Country | Kind |
---|---|---|---|
47-41259 | Apr 1972 | JA |
Number | Name | Date | Kind |
---|---|---|---|
1542971 | Sperr, Jr. et al. | Jun 1925 | |
1653933 | Sperr et al. | Dec 1927 | |
3086838 | Giammarco | Apr 1963 |
Number | Date | Country |
---|---|---|
17,302 | Jan 1930 | AU |
Entry |
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Horntvedt, "A Sodium-Base Sulfite Recovery Process Based on Pyrolysis", Journal of the Technical Association of the Pulp & Paper Ind., Vol. 53, No. 11, Nov. 1970 pp. 2147-2152. |