Hiroyuki Nagashima
111Patents
16h-index
111Co-inventors
89Inventor score
Filing activity: Sep 28, 1987 → Oct 17, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8929140B2 | Memory system in which a read level is changed based on standing time and at least one of a read, write or erase count | Physics | 33 | Active |
| US7024133B2 | Image forming apparatus using a user installable process cartridge, a method of arranging the process cartridge, and the process cartridge itself | Physics | 30 | Expired |
| US9767913B2 | Memory system performing read of nonvolatile semiconductor memory device | Physics | 28 | Active |
| US4780067A | Multicylinder rotary compressor | Mechanical Engineering; Lighting; Heating | 28 | Expired |
| US8044456B2 | Nonvolatile semiconductor memory device and producing method thereof | Electricity | 24 | Active |
| US7242615B2 | Non-volatile semiconductor memory device | Physics | 23 | Expired |
| US7136610B2 | Image forming apparatus using installable process cartridge, method of positioning process cartridge, and process cartridge itself | Physics | 23 | Expired |
| US8222677B2 | Semiconductor memory device and method of manufacturing the same | Electricity | 23 | Active |
| US6975830B2 | Image forming apparatus, process cartridge, and waste toner recovery device | Physics | 22 | Expired |
| US8575590B2 | Nonvolatile semiconductor memory device | Physics | 21 | Active |
| US7043182B2 | Developer regulating member, developing device, electrophotographic image forming process cartridge, and image forming apparatus including the developer regulating member | Physics | 20 | Expired |
| US5999772A | Image forming apparatus with support member | Physics | 20 | Expired |
| US8274068B2 | Semiconductor integrated circuit device and method of fabricating the same | Electricity | 20 | Active |
| US5287158A | Image forming apparatus with image reading unit | Physics | 19 | Expired |
| US7062194B2 | Charging device, and process cartridge and image forming apparatus including the charging device | Physics | 18 | Expired |
| US7110696B2 | Cleaning unit, process cartridge, and image forming apparatus | Physics | 16 | Expired |
| US7957203B2 | Nonvolatile semiconductor memory device | Physics | 16 | Active |
| US7688632B2 | Nonvolatile semiconductor memory capable of trimming an initial program voltage for each word line | Physics | 15 | Active |
| US4981992A | Process for preparing optically active 3-hydroxybutanoic acid | Emerging Cross-Sectional Technologies | 15 | Expired |
| US7272354B2 | Cleaning unit and image forming apparatus having multiple cleaning blades | Physics | 14 | Expired |
| US7139504B2 | Charging device, and process cartridge and image forming apparatus using the charging device | Physics | 14 | Expired |
| US8964447B2 | Nonvolatile semiconductor memory device | Physics | 13 | Active |
| US6687474B2 | Developing apparatus, image formation apparatus, and process cartridge | Physics | 13 | Expired |
| US7272342B2 | Image forming apparatus having a detachable cartridge including a photoconductive drum with axis shaft having a minimal rotational eccentricity, and a method of assembling the image forming apparatus | Physics | 13 | Active |
| US7295796B1 | Image forming apparatus having a temporary toner holding device and a toner collecting device | Physics | 13 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.