Number | Date | Country | Kind |
---|---|---|---|
1-89719 | Apr 1989 | JPX | |
1-96346 | Apr 1989 | JPX | |
2-84843 | Apr 1990 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3367926 | Voeks | Feb 1968 | |
4500681 | Shulman | Feb 1985 |
Number | Date | Country |
---|---|---|
0428972 | May 1991 | EPX |
Entry |
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World Patent Index Latest; Week 8814; AN 83-779353[40] & JP-A-58 142 818 (Idemitsu Pertrochem) Aug. 25, 1983 (Abstract). |
World Patent Index Latest; Week 9101; AN 86-261852[40] & JP-A-61 189 920 (Idemitsu Pertrochem, KK) Aug. 23, 1986 (Abstract). |