Number | Name | Date | Kind |
---|---|---|---|
4267306 | Davis et al. | May 1981 | |
4359570 | Davis et al. | Nov 1982 | |
4403092 | Davis et al. | Sep 1983 | |
4477635 | Mitra | Oct 1984 | |
4617373 | Pruett et al. | Oct 1986 | |
5043376 | Sharma et al. | Aug 1991 | |
5104913 | Sharma et al. | Apr 1992 | |
5188641 | Parton | Feb 1993 | |
5344872 | Debord et al. | Sep 1994 |
Number | Date | Country |
---|---|---|
877402 | Sep 1961 | GBX |
Entry |
---|
Derwent Abstract Great Britain 914354 (1970). |
Derwent Abstract Great Britain 1,046,751 (1963). |
Derwent Abstract Great Britain 1,218,547 (1967). |