Number | Date | Country | Kind |
---|---|---|---|
4101822 | Jan 1991 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3700623 | Keim | Oct 1972 | |
3932363 | Lehmann et al. | Jan 1976 | |
4975499 | Bachem et al. | Dec 1990 | |
5082527 | Bachem et al. | Jan 1992 | |
5093470 | Bachem et al. | Mar 1992 |
Number | Date | Country |
---|---|---|
0335158 | Oct 1989 | EPX |
Entry |
---|
Database WPIL, Section Ch, Week 8634, Dec. 27, 1984, Derwent Publications Ltd., London, GB, Class A, AN 222138 & JP-A-61 152 900 (Arakawa Kagaku Kogyo). |