John P. Freeman
9Patents
4h-index
12Co-inventors
50Inventor score
Filing activity: Aug 16, 1973 → Aug 15, 1988
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4451557A | Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements | Physics | 20 | Expired |
| US4378426A | Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements | Physics | 14 | Expired |
| US4578348A | Hydrolyzed azolium speed enhancing/fog-inhibiting agents for silver halide photography | Physics | 7 | Expired |
| UST104903I4 | Photographic speed increasing and latent image stabilizing compounds | General | 4 | Expired |
| UST103803I4 | Photographic speed increasing and latent image stabilizing compounds, silver halide emulsions, and photographic elements | General | 4 | Expired |
| US3936308A | Photographic emulsions containing methine dyes having a 1H-imidazo[4,5-b]pyrazine nucleus | Physics | 3 | Expired |
| US4861703A | Cyclic dichalcogenide fog inhibiting agents for silver halide photography | Physics | 3 | Expired |
| US4007170A | Photographic emulsions containing methine dyes having a 1H-imidazo[4,5-b]pyrazine nucleus | Physics | 1 | Expired |
| US4737439A | Photographic compositions and elements including internal latent image silver halide grains and nucleating agents therefor | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.