Security yarn and production method therefor
US7338709B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 10, 2000 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Mar 9, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2951
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
According to the present invention, there is provided a security thread whose existence is not clarified, which is prevented beforehand from being removed, which can be attached even to a form of a commodity heretofore regarded as difficult, and whose use purpose range is enlarged, and the security thread can be constituted by a core member comprising a soft magnetic fiber (1) or the soft magnetic fiber and a core thread (4), and a cover member (2, 3) comprising a nonmetal material to cover the core member, constituted by covering the core member comprising the soft magnetic fiber or the soft magnetic fiber and core thread and a semi-hard magnetic material (10′) with the cover member, or constituted by covering the soft magnetic fiber or the core member comprising the soft magnetic fiber and a thermal welding thread (9) with the cover member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.