FIELD: protection of documents. SUBSTANCE: protected document has protective marking for prevention of forgery. Protective marking has many holes which form some pattern on document with diameter of holes invisible in reflected light by naked eye, but visible in transmitted light. Preventive markings are easily identified without special knowledge or equipment. EFFECT: higher efficiency. 23 cl, 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| SECURITY DOCUMENT WITH HOLOGRAPHIC FILM AND PRINTED MACHINE-READABLE MARKING | 2010 |
|
RU2546510C2 |
| PROTECTED DOCUMENT WITH SOURCE OF LIGHT AND DEVICE FOR INFLUENCE AT LIGHT | 2005 |
|
RU2386543C2 |
| SECURITY DOCUMENT WITH MICRO-PERFORATION | 2012 |
|
RU2619039C2 |
| DOCUMENT WITH COUNTER-FALSIFICATION PROTECTION AND METHOD FOR CHECKING SAID DOCUMENT | 2002 |
|
RU2286886C2 |
| PROTECTED DOCUMENT WITH OPTICAL WAVE GUIDE | 2009 |
|
RU2531900C2 |
| FORGERY-PROTECTED DOCUMENT (VARIANTS) | 2003 |
|
RU2315355C2 |
| PROTECTED DOCUMENT | 2019 |
|
RU2775784C2 |
| SECURITY DOCUMENT WITH SECURITY FEATURES | 2012 |
|
RU2622834C2 |
| SECURITY FEATURE FOR A SECURITY DOCUMENT | 2014 |
|
RU2671039C2 |
| IMPORTANT DOCUMENT AND METHOD OF IMPORTANT DOCUMENT MANUFACTURING | 2005 |
|
RU2372206C2 |
