Fumio Sugai
26Patents
5h-index
29Co-inventors
69Inventor score
Filing activity: Mar 25, 1994 → Jun 7, 2017
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5863688A | Naphthoquinone derivative | Physics | 15 | Expired |
| US6127076A | Naphthalenetetracarboxylic acid diimide derivatives and photosensitive material for electrophotography | Chemistry; Metallurgy | 11 | Expired |
| US5994012A | Naphthoquinone derivative and electrophotosensitive material using same | Physics | 10 | Expired |
| US5976742A | Naphthoquinone derivative and electrophotographic material using the naphthoquinone derivative | Physics | 10 | Expired |
| US6174638A | Naphthalenetetracarboxylic acid diimide derivatives and photosensitive materials for electrophotography | Physics | 7 | Expired |
| US5773613A | Tryptoanthrinimine derivative and electrophotosensitive material using the same | Physics | 5 | Expired |
| US5977389A | Naphthoquinone derivative | Physics | 4 | Expired |
| US6346355B2 | Electrophotosensitive material | Physics | 3 | Expired |
| US5468874A | Benzothiophene/indole-substituted maleimide derivatives, photochromic material comprising said derivatives and optical recording material using the same material | Chemistry; Metallurgy | 2 | Expired |
| US5817810A | Tryptanthrine compounds | Physics | 2 | Expired |
| US6500592B2 | Electrophotosensitive material | Physics | 1 | Expired |
| US6395439B1 | Naphthoquinone derivative and electrophotosensitive material using the same | Physics | 1 | Expired |
| US9690217B2 | Triarylamine derivative, electrophotographic photosensitive member, and image forming apparatus | Physics | 1 | Active |
| US9436105B2 | Triarylamine derivative and electrophotographic photosensitive member | Electricity | 1 | Active |
| US10126667B2 | Quinone derivative and electrophotographic photosensitive member | Physics | 0 | Active |
| US9964869B2 | Triarylamine derivative, electrophotographic photosensitive member, and method for producing electrophotographic photosensitive member | Physics | 0 | Active |
| US9447022B2 | Triarylamine derivative and electrophotographic photosensitive member | Physics | 0 | Active |
| US9783493B2 | Quinone derivative and electrophotographic photosensitive member | Chemistry; Metallurgy | 0 | Active |
| US9376371B2 | Triphenylamine derivative, method for manufacturing the same, and electrophotographic photosensitive member | Physics | 0 | Active |
| US9581921B2 | Electrophotographic photosensitive member | Physics | 0 | Active |
| US9494881B2 | Triarylamine derivative and electrophotographic photosensitive member | Physics | 0 | Active |
| US6376142B2 | Electrophotosensitive material containing specific maleimide derivative | Physics | 0 | Expired |
| US9783491B2 | Quinone derivative and electrophotographic photosensitive member | Physics | 0 | Active |
| US7468230B2 | Wet-developing electrophotographic photoconductor and wet-developing image | Physics | 0 | Expired |
| US9454091B2 | Hydrazone derivative of triphenylamine and electrophotographic photosensitive member | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.