Method for adding RF powder and RF powder-added base sheet
US8766853B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2007 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Jan 19, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/2208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method is provided for adding an RF powder to a sheet-like object having a high property value, such as a variety of cards, paper money, and securities. The RF powder makes it very difficult to produce, for example, counterfeit cards, documents and bills. Also, an RF powder-added base sheet to which the RF powder has been added is provided. In the method for adding the RF powder, the RF powder includes a plurality of RF powder particles 11 and is disposed on a surface of a base sheet 10 to add the RF powder to the base sheet. Each RF powder particle 11 has a magnetic field coupling circuit element in a high frequency magnetic field having a specific frequency. The RF powder is disposed on a surface of a base sheet by a printing technique. The RF powder-added base sheet 10 includes an RF powder including a plurality of RF powder particles 11 disposed within a printed object on a surface of a base sheet. Each RF powder particle 11 has a magnetic field coupling circuit element in a high frequency magnetic field having a high frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.