| Number | Date | Country | Kind |
|---|---|---|---|
| 9416349 | Aug 1994 | GBX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4271352 | Thomas | Jun 1981 | |
| 4918425 | Greenberg et al. | Apr 1990 | |
| 5025141 | Bolan | Jun 1991 | |
| 5030807 | Landt et al. | Jul 1991 | |
| 5091771 | Bolan et al. | Feb 1992 | |
| 5113344 | Kellogg et al. | May 1992 | |
| 5151684 | Johnsen | Sep 1992 | |
| 5153583 | Murdoch | Oct 1992 | |
| 5469363 | Saliga | Nov 1995 | |
| 5517194 | Carroll et al. | May 1996 | |
| 5521602 | Carroll et al. | May 1996 | |
| 5528232 | Verma et al. | Jun 1996 |
| Number | Date | Country |
|---|---|---|
| 0323859 | Jul 1989 | EPX |
| 0597457 | May 1994 | EPX |
| 9319993 | Oct 1993 | WOX |
| Entry |
|---|
| "Miniture, Coin-Shaped Chip is Read or Written with a Touch"; Dallas Semiconductor; News Release Jul. 1991. |