Security element in the form of a thread or strip to be embedded in security documents and methods of producing it
US5876068A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1996 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | May 14, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/48
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A security element in the form of a thread or strip to be embedded in security documents such as bank notes, checks, bonds, identity cards, credit cards or the like, having characters, patterns, etc., that are readable by transmitted light to the naked eye and/or by machine. The security element consists of a transparent plastic film having an opaque coating extending over the element with recesses in the form of the characters and patterns to be introduced. The security element also contains, in areas congruent with the recesses, coloring and/or luminescent substances which cause the characters and/or patterns to differ from the security document and from the opaque coating by color contrast under suitable light conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.