Process of screen manufacture and use for coding credit cards
US3987725A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1974 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | Mar 18, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06046
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for forming credit cards in which encoded information is screen printed on a plastic sheet. In the process, a photographic film is placed in contact with a surface having film exposure means positioned with respect to the surface. Locating means are formed on the film and the film is positioned on the surface through the locating means. Thereafter, small predetermined coded spaces are exposed on the film and the exposed film is developed to provide coded darkened spaces corresponding to the exposed coded spaces. The developed film is placed against a silk screen having first positioning means which coact with the locating means on the film to position the film with respect to the silk screen. The screen is coated with a light-sensitive emulsion and light is shone on the screen through the film to expose the emulsion except at the coded darkened areas. The screen is washed to provide a coded screen having openings corresponding to the exposed coded spaces on the film. The coded screen is placed in a silk screen press with second positioning means corresponding in placement to the first positioning means. The screen is placed in the press by alignment of the second position…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.