Size dependent marker codes
US8398888B2 · kind B2 · utility
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2References
21Claims
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Key dates
| Filing date | Feb 13, 2012 |
| Grant date | Mar 19, 2013 |
| Priority date | — |
| Expiry date | Feb 13, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M3/144
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A security marker material comprising emissive particles selected from at least two groups with different size distributions and the size distributions satisfy the formula:[(x−z)2/(Sx2+Sz2)]1/2>1wherein x and z are the volume-weighted mean equivalent-spherical diameters of the two particle distributions and Sx and Sz are the standard deviations of the same two distributions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.