David E. Johnson
5Patents
4h-index
10Co-inventors
54Inventor score
Filing activity: May 3, 1982 → Jun 3, 2011
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4514692A | Metal detector and discriminator using differentiation for background signal suppression | Physics | 47 | Expired |
| US4628265A | Metal detector and classifier with automatic compensation for soil magnetic minerals and sensor misalignment | Physics | 30 | Expired |
| US7938075B1 | Automated seed detection and planting synchronization apparatus, method and system | Emerging Cross-Sectional Technologies | 29 | Active |
| US7116760B2 | System and method for single-ended line analysis for qualification and mapping | Electricity | 7 | Expired |
| US8878537B1 | Method and apparatus to minimize gradient errors in buried utility depth measurements | Physics | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.