Presensitized plastic card, tamperproof identification card prepared therefrom, and process for manufacture of tamperproof identification card
US4370397A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1980 |
| Grant date | Jan 25, 1983 |
| Priority date | — |
| Expiry date | Apr 22, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A tamperproof identification card such as a passport or credit card is provided. A diazo photosensitive composition is intimately mixed with a thermo-adhesive resin and is carefully deposited as a uniformly thin layer in one or more zones on a plastic support material. The zones of the photosensitive compositions are developed to reproduce identifying information such as a photograph, identification number, etc. A plastic protective film is then laminated to the support to protect the identifying information. Since the adhesive resin material is intimately mixed throughout the photosensitive composition, the protective plastic film cannot be removed without destroying the information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.