Number | Date | Country | Kind |
---|---|---|---|
3008194 | Mar 1980 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
1906440 | Wirth | May 1933 | |
1914750 | Marsh | Jun 1933 | |
3995013 | Demarq | Nov 1976 | |
4265865 | Munster et al. | May 1981 |
Number | Date | Country |
---|---|---|
2461905 | Aug 1976 | DEX |
Entry |
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Ullman, Enzyklopadie der technischen Chemie (Encyclopedia of Industrial Chemistry) 3rd Ed., vol. 13, p. 563. |
Kirk-Othmer 2nd Ed., vol. 15, p. 307. |