System for verifying authenticity of various articles
US4837840A · kind A · utility
39Cited by
14References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Feb 26, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Representations are developed that characterize an article for identification by comparison with a reference standard as an escort memory. The representations are reduced to a binary tri-level code covering two extreme possibilities and an intermediate range for indecisive cases. Characteristics are sensed by light in one form by interferometer techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.