Ludwig Devrient
6Patents
6h-index
2Co-inventors
45Inventor score
Filing activity: Feb 20, 1980 → Mar 26, 1986
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4544181A | Identification card | Emerging Cross-Sectional Technologies | 56 | Expired |
| US4597592A | Identification card with duplicate data | Emerging Cross-Sectional Technologies | 35 | Expired |
| US4496961A | Check paper that is protected against forgery and tampering | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4672891A | Method of producing an identification card | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4504083A | Guilloche identification card | Performing Operations; Transporting | 17 | Expired |
| US4629630A | Check paper that is protected against forgery and tampering | Emerging Cross-Sectional Technologies | 16 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.