Hirofumi Hayata
36Patents
5h-index
35Co-inventors
69Inventor score
Filing activity: Feb 22, 1990 → Apr 8, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5942359A | Electrophotoreceptor | Physics | 11 | Expired |
| US5718997A | Electrophotographic photoreceptor | Physics | 8 | Expired |
| US6514651B1 | Metal phthalocyanine crystal particles, production method thereof, and electrophotographic photoreceptor as well as electrophotographic process using the same | Physics | 5 | Expired |
| US5589314A | Image forming method using an imidazole-perylene electrophotographic photoreceptor | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5079119A | Photoreceptor | Physics | 5 | Expired |
| US6399263B1 | Electrophotographic photoreceptor, electrophotographic process, and electrophotographic image forming method | Physics | 5 | Expired |
| US6268097A | Electrophotographic photoreceptor | Physics | 3 | Expired |
| US5077163A | Electrophotographic photoreceptor | Physics | 3 | Expired |
| US8557486B2 | Organic photoreceptor, manufacturing method of organic photoreceptor, and image forming apparatus | Physics | 3 | Active |
| US7402366B2 | Organic photoreceptor, process cartridge, image forming method, and image forming apparatus | Physics | 3 | Expired |
| US5849444A | Electrophotographic photoreceptor with aliphatic amine containing electron transporting layer | Physics | 2 | Expired |
| US5589309A | Electrophotographic photoreceptor containing perylenes | Physics | 2 | Expired |
| US8771910B2 | Electrophotographic photoreceptor | Physics | 2 | Active |
| US6544703B2 | Electrophotographic photoreceptor, electrophotographic process, and electrophotographic image forming method | Physics | 2 | Expired |
| US6027845A | Electrophotography photosensitive element | Physics | 1 | Expired |
| US6620567B2 | Electrophotographic photoreceptor, image forming apparatus and processing cartridge | Physics | 1 | Expired |
| US9436108B2 | Electrophotographic photoreceptor | Physics | 1 | Active |
| US8404417B2 | Organic photoreceptor, image forming apparatus and process cartridge | Physics | 1 | Active |
| US8084172B2 | Organic photoreceptor, image forming apparatus, process cartridge, and color image forming apparatus | Physics | 1 | Active |
| US5166022A | Electrophotographic photoreceptor | Physics | 1 | Expired |
| US5270140A | Bisstyryl compound and the electrophotographic photoreceptors relating thereto | Physics | 0 | Expired |
| US11976230B2 | Photoresponsive material, adhesive, optical switching material, toner, and image forming method | Physics | 0 | Active |
| US11702398B2 | Photoresponsive low-molecular weight material, adhesive, toner, and image forming method | Physics | 0 | Active |
| US8354212B2 | Electrophotographic photoreceptor, image forming apparatus, and method for image formation | Physics | 0 | Active |
| US6878496B2 | Electrophotoreceptor, image forming method, image forming apparatus and processing cartridge | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.