Douglas W. Constable
28Patents
8h-index
10Co-inventors
72Inventor score
Filing activity: May 26, 1976 → Oct 6, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4090216A | Ambient light contrast and color control circuit | Electricity | 250 | Expired |
| US5619737A | Encodement-on-film recording apparatus utilizes flash components in a camera | Physics | 111 | Expired |
| US6826365B1 | Battery saving flash charger control | Physics | 16 | Expired |
| US5761541A | Single use camera with flash charging circuit | Physics | 13 | Expired |
| US4694356A | Modification of color component video signals to compensate for decreasing white sensitivity of photographic element | Electricity | 12 | Expired |
| US6038408A | Optical data recording circuit for a film camera | Physics | 11 | Expired |
| US5781804A | Single touch flash charger circuit with timer control | Electricity | 8 | Expired |
| US6768869B2 | Camera body, camera and method for assembling same | Electricity | 8 | Expired |
| US4694355A | Black and white level adjustment and normalization circuit for a color video printer | Electricity | 7 | Expired |
| US5303056A | Dynamic gain correction for CRT printing | Electricity | 6 | Expired |
| US5713055A | Ambient light sensitive automatic flash control circuit | Physics | 6 | Expired |
| US5634153A | Static immunity for single touch flash charger control | Electricity | 6 | Expired |
| US5729774A | Low cost motorized camera with flash control circuit | Physics | 5 | Expired |
| US4106055A | Automatic color level control system with threshold tracking | Electricity | 5 | Expired |
| US6054814A | Camera flash charging apparatus for low cost single use camera | Electricity | 4 | Expired |
| US5567543A | Filmstrip and flexible battery unit | Electricity | 4 | Expired |
| US5140422A | Video sync removal circuit | Electricity | 3 | Expired |
| US6351608B1 | One-time-use camera with external flash unit | Physics | 3 | Expired |
| US5574521A | Optical film encoding apparatus | Physics | 3 | Expired |
| US6442346B1 | Flash apparatus with one-time-use camera | Physics | 3 | Expired |
| US6035141A | Optical data recording circuit for a film camera | Physics | 2 | Expired |
| US5870639A | Optical data recording circuit for a photographic camera | Physics | 2 | Expired |
| US6574430B1 | Camera electronic system and method of assembling same | Physics | 2 | Expired |
| US4178610A | Clamp circuit for RGB output stages | Electricity | 2 | Expired |
| US5390020A | Video amplifier stabilization for CRT printing | Electricity | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.