Process for making identification cards
US3930924A · kind A · utility
39Cited by
5References
8Claims
0Family size
Inventors
Key dates
| Filing date | Feb 28, 1973 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Feb 28, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/109
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method of making an identification card which comprises making any required characters, designs and/or embossings on the base material of the card, further providing a colored layer on the bass material of the card and then engraving the colored layer and base to varying depths in the form of fine lines and and points so that, by regulating the ratio of the surface areas of the engraved part and unengraved part, the differences in the color thickness and luster may be expressed to form an engraved image by which the user can be identified and which image has no projections thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.