Friedrich Kretschmar
9Patents
4h-index
34Co-inventors
57Inventor score
Filing activity: Aug 4, 1999 → Jul 29, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7849993B2 | Devices and method for the production of sheet material | Performing Operations; Transporting | 63 | Expired |
| US6382677B1 | Security element and method for producing same | Emerging Cross-Sectional Technologies | 41 | Expired |
| US6726813B2 | Security device and method for producing it | Emerging Cross-Sectional Technologies | 33 | Expired |
| US8276945B2 | Security element provided with an optically-variable layer and method for the production thereof | Performing Operations; Transporting | 6 | Active |
| US9336640B2 | Security element for securing documents of value | Performing Operations; Transporting | 3 | Active |
| US12189157B2 | Semi-finished product, security element, methods of producing them and document of value | Performing Operations; Transporting | 0 | Active |
| US8622435B2 | Security element and method for producing the same | Performing Operations; Transporting | 0 | Expired |
| US8382163B2 | Security paper | Emerging Cross-Sectional Technologies | 0 | Active |
| US8740094B2 | Security element for protecting documents of value | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.