Transaction approval system
US4822985A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1987 |
| Grant date | Apr 18, 1989 |
| Priority date | — |
| Expiry date | Jan 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/403
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improved system is disclosed for detecting invalid transaction cards at remote transaction terminals. The system includes providing each terminal with a master table having data corresponding to invalid cards. The data in the master table is less than the actual account numbers of the invalid cards. By using a compressed version of the data, the file can be shortened to facilitate storage and transmission. The compressed data file is arranged such that when an invalid card is presented, it will be identified and routed on for further processing. In the preferred embodiment, the probability that a valid card will be identified as potentially invalid is on the order of one of three percent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.