Kurt Ehrat
14Patents
8h-index
3Co-inventors
61Inventor score
Filing activity: Oct 6, 1964 → Aug 10, 1983
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3990558A | Method and apparatus for preparing and assessing payment documents | Physics | 68 | Expired |
| US4145568A | Method and apparatus for ciphering and deciphering messages | Electricity | 45 | Expired |
| US4361757A | Card-like data carrier | Physics | 41 | Expired |
| US4131879A | Method and apparatus for determining the relative positions of corresponding points or zones of a sample and an orginal | Physics | 22 | Expired |
| US4145569A | Method and apparatus for synchronizing the ciphering and deciphering of binary-coded messages | Electricity | 19 | Expired |
| US3959592A | Method and apparatus for transmitting and receiving electrical speech signals transmitted in ciphered or coded form | Physics | 13 | Expired |
| US4143279A | Method and apparatus for testing the print quality of printed texts, more particularly banknotes | Physics | 9 | Expired |
| US4139779A | Method of assessing a printed article | Physics | 8 | Expired |
| US4030325A | Lock | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4362930A | Data carrier card | Physics | 5 | Expired |
| US4303832A | Process for assessing the quality of a printed product | Physics | 4 | Expired |
| US4566694A | Magnetic game | Human Necessities | 2 | Expired |
| US4300298A | Apparatus for the production and display of moving pictures | Physics | 1 | Expired |
| US4534195A | Mechanical lock having a variable key | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.