Method and apparatus for communication for a data-storing token
US4928000A · kind A · utility
29Cited by
9References
11Claims
0Family size
Inventors
Key dates
| Filing date | Aug 19, 1988 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Aug 19, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/28
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data-storing token includes a microprocessor which responds to a signal generated by a token interrogator for altering its clock frequency so as to achieve synchronization between the token and interrogator operations. Additional synchronization is achieved by adjusting the length of delay loops in routines used for communication between the token and the interrogator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.