Number | Name | Date | Kind |
---|---|---|---|
4150623 | Hamilton | Apr 1979 | A |
4834844 | Pliefke et al. | May 1989 | A |
Number | Date | Country |
---|---|---|
0 046 656 | Mar 1982 | EP |
0 389 283 | Sep 1990 | EP |
WO 93 23485 | Nov 1993 | WO |
Entry |
---|
Database WPI, Week 197433, Derwent Publications Ltd., London, GB, Jul. 1974. |