David K. Campbell
40Patents
13h-index
52Co-inventors
84Inventor score
Filing activity: May 16, 1980 → May 18, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4389671A | Digitally-controlled analog encrypton | Electricity | 241 | Expired |
| US6812907B1 | Segmented electronic display | Physics | 118 | Expired |
| US5969372A | Film scanner with dust and scratch correction by use of dark-field illumination | Physics | 74 | Expired |
| US7262798B2 | System and method for simulating fill flash in photography | Electricity | 66 | Expired |
| US5432763A | Subminiature rotary actuator optical head | Physics | 45 | Expired |
| US7084910B2 | System and method for using multiple images in a digital image capture device | Electricity | 37 | Expired |
| US4688201A | Focusing and tracking apparatus for an optical data storage device | Physics | 27 | Expired |
| US5995243A | Illumination system with white level calibration for hand-held scanner | Electricity | 20 | Expired |
| US5197058A | Electronic offset compensation of the continuous composite track error signal in optical recording | Physics | 18 | Expired |
| US7298414B2 | Digital camera autofocus using eye focus measurement | Electricity | 16 | Expired |
| US4332029A | Automatic alignment system for a digital modem | Physics | 16 | Expired |
| US7167201B2 | Device incorporating eye-start capability | Physics | 15 | Expired |
| USD484162S1 | Camera | General | 13 | Expired |
| US5723859A | Line contact hand-held scanning device and method having a light path substantially perpendicular to the orientation of the object at a line portion | Electricity | 13 | Expired |
| US7016604B2 | Autofocus using a holographic aperture element | Physics | 12 | Expired |
| US5070493A | Wedge prism assembly for optical information storage | Physics | 12 | Expired |
| US5435611A | Aluminum can handling tongs | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5777321A | Scanning device with non-contact optical components | Electricity | 10 | Expired |
| US5665963A | Reflective color filter for color correction of photodetector filters | Physics | 10 | Expired |
| US4423488A | Digital filter employing PROM for storing positive and negative impulse response values | Electricity | 8 | Expired |
| US6993256B2 | Zoom and focus control method and system | Physics | 6 | Expired |
| US6714731B2 | Zoom and focus control method and system | Physics | 5 | Expired |
| US7502057B2 | Method and apparatus for color non-uniformity correction in a digital camera | Electricity | 4 | Expired |
| US7233352B2 | Method and apparatus for color non-uniformity correction in a digital camera | Electricity | 4 | Expired |
| US8558943B2 | System and method for image capture device | Electricity | 3 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.