Number | Date | Country | Kind |
---|---|---|---|
3716899 | May 1987 | DEX |
Filing Document | Filing Date | Country | Kind | 102e Date | 371c Date |
---|---|---|---|---|---|
PCT/EP88/04440 | 5/19/1988 | 11/17/1989 | 11/17/1989 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO88/09305 | 12/1/1988 |
Number | Name | Date | Kind |
---|---|---|---|
3430418 | Wagner | Mar 1969 | |
3564816 | Batta | Feb 1971 | |
3636679 | Batta | Jan 1972 | |
3738087 | McCombs | Jun 1973 | |
3923477 | Armond et al. | Dec 1975 | |
4077779 | Sircar et al. | Mar 1978 | |
4444572 | Avon et al. | Apr 1984 | |
4477265 | Kumar et al. | Oct 1984 | |
4790858 | Sircar | Dec 1988 | |
4892565 | Schmidt et al. | Jan 1990 | |
4913709 | Kumar | Apr 1990 | |
4914218 | Kumar et al. | Apr 1990 |
Number | Date | Country |
---|---|---|
0071553 | Feb 1983 | EPX |
0092695 | Nov 1983 | EPX |
0112640 | Jul 1984 | EPX |
2504653 | Nov 1975 | DEX |
3122701 | Dec 1982 | DEX |
3132758 | Mar 1983 | DEX |
Entry |
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Bulletin 675 Helium-1985 U.S. Department of Interior, A Chapter from Mineral Facts and Problems. |
Chemical Abstracts, vol. 92, No. 14 -Apr. 1980, 92:11309a (p. 127). |