Write-once-read-once batteryless authentication token
US5032708A · kind A · utility
61Cited by
3References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Aug 10, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C17/18
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A write-once-read-once batteryless token stores access data using fuses similar to those found in programmable fuse link devices. These fuses indicate the status of a particular bit in either of two memory arrays. An intact fuse indicates that a bit is a logical zero, and a blown fuse indicates that a bit is a logical one. The process of reading a particular bit in either array causes the destruction of the corresponding memory cells in both arrays before the data from the selected cell becomes available to the reading device. The memory bit cells are destroyed by blowing the bit fuse during the read cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.