Number | Name | Date | Kind |
---|---|---|---|
3761683 | Rogers | Sep 1973 | |
4683371 | Drexler | Jul 1987 | |
4745268 | Drexler | May 1988 | |
4811408 | Goldman | Mar 1989 | |
4879747 | Leighton et al. | Nov 1989 | |
4961229 | Takahashi | Oct 1990 | |
4993068 | Piosenka et al. | Feb 1991 | |
4995081 | Leighton et al. | Feb 1991 | |
5053608 | Senanayake | Oct 1991 | |
5070452 | Doyle, Jr. et al. | Dec 1991 | |
5241165 | Drexler | Aug 1993 | |
5259025 | Monroe et al. | Nov 1993 |
Entry |
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"Smart Credit Cards--The Answer to Cashless Shopping"; Stephen B. Weinstein; IEEE Spectrum Feb. 1994 pp. 43-49. |