Number | Name | Date | Kind |
---|---|---|---|
4799258 | Davies | Jan 1989 | |
4837822 | Crosley et al. | Jun 1989 | |
4974193 | Beutelspacher et al. | Nov 1990 | |
5001752 | Fischer | Mar 1991 | |
5136647 | Haber et al. | Aug 1992 |
Number | Date | Country |
---|---|---|
0422757A2 | May 1990 | EPX |
WO9212485 | Jul 1992 | WOX |
Entry |
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Smart Card 2000: The future of IC Cards, D Chaum & I. Schaumuller-Cichl, pp. 139-146, Laxenburg, Austria, Oct. 19-20, 1987. |