Number | Date | Country | Kind |
---|---|---|---|
89 09383 | Jul 1989 | FRX |
Number | Name | Date | Kind |
---|---|---|---|
3306875 | Hay | Feb 1967 | |
3598864 | Caldwell et al. | Aug 1971 | |
4137219 | Idel et al. | Jan 1979 | |
4182842 | Jackson et al. | Jan 1980 | |
4764582 | Hisgen et al. | Aug 1988 | |
4864009 | Finke et al. | Sep 1989 | |
4900802 | Quentin | Feb 1990 | |
4904756 | Quentin | Feb 1990 | |
4925911 | Quentin | May 1990 |
Number | Date | Country |
---|---|---|
0272992 | Dec 1987 | EPX |
Entry |
---|
European Search Report No. EP 90 40 1997. |