Number | Date | Country | Kind |
---|---|---|---|
63-279394 | Nov 1988 | JPX | |
1-52095 | Mar 1989 | JPX | |
1-122936 | May 1989 | JPX | |
1-122938 | May 1989 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
4913938 | Kawakami et al. | Apr 1990 |
Number | Date | Country |
---|---|---|
0322764 | May 1989 | EPX |
Entry |
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Soviet Inventions Illustrated, week B26, Aug. 8, 1979, section Chemical, abstract No. 486528/26, Derwent Publications Ltd., London, GB; SU-A-621 801 (Ermolaev, . RMOLAV VI.) Jul. 21, 1978. |
Soviet Inventions Illustrated, week Y23, Jul. 19, 1977, G 02, abstract No. 4111Y/23, Derwent Publication Ltd., London, GB; & SU-A-523 963 (AS Ukr Water Chem.) Oct. 22, 1976. |