Toru Oguma
81Patents
25h-index
55Co-inventors
91Inventor score
Filing activity: Feb 8, 1993 → Jun 7, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5768658A | Electrode member, developing apparatus, process cartridge and image forming apparatus | Physics | 164 | Expired |
| US6272299A | Process cartridge and electrophotographic image forming apparatus | Physics | 145 | Expired |
| US7024131B2 | Process cartridge assembling method, process cartridge remanufacturing method, and connecting member | Physics | 127 | Expired |
| US6097909A | Photosensitive drum mounting method, process cartridge and electrophotographic image forming apparatus | Physics | 115 | Expired |
| US5790923A | Developing apparatus | Physics | 95 | Expired |
| US6266500A | Developing apparatus and process cartridge | Physics | 73 | Expired |
| US6735405B2 | Method of remanufacturing process cartridge and developing device | Physics | 69 | Expired |
| US5812909A | Developing device | Physics | 61 | Expired |
| US5455665A | Cleaning apparatus with a member to prevent peeling of a guide member, and a process cartridge and image forming apparatus using the same | Physics | 60 | Expired |
| US6993264B2 | Process cartridge and electrophotographic image forming apparatus | Physics | 51 | Expired |
| US7062192B2 | Electrophotographic image forming apparatus, process cartridge and discharge preventing mechanism | Physics | 51 | Expired |
| US6377759B1 | Process cartridge, electrophotographic image forming apparatus and developer amount detecting member | Physics | 49 | Expired |
| US6832057B2 | Developing device, process cartridge, and electrophotographic image forming apparatus | Physics | 47 | Expired |
| US8571445B2 | Cartridge and electrophotographic image forming apparatus | Physics | 44 | Active |
| US6804475B2 | PROCESS CARTRIDGE COMPRISING GROUNDING, CHARGING BIAS, AND DEVELOPING BIAS CONTACTS AND INPUT AND OUTPUT CONTACTS, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS TO WHICH THE PROCESS CARTRIDGE IS DETACHABLY MOUNTABLE | Physics | 40 | Expired |
| US6868243B2 | Image forming apparatus having process cartridge with connection arrangement for side frame bodies | Performing Operations; Transporting | 38 | Expired |
| US6952544B2 | Method of reproducing process cartridge or developing apparatus | Physics | 37 | Expired |
| US7162176B2 | Process cartridge and electrophotographic image forming apparatus | Physics | 35 | Expired |
| US7073251B2 | Disassembling tool for process cartridge | Emerging Cross-Sectional Technologies | 35 | Expired |
| US7296341B2 | Disassembling tool for process cartridge | Emerging Cross-Sectional Technologies | 34 | Expired |
| USD863419S1 | Flange coupling for process cartridge for image forming apparatus | General | 34 | Active |
| US7315706B2 | Process cartridge and electrophotographic image forming apparatus | Physics | 30 | Active |
| US7865115B2 | Process cartridge, electrophotographic image forming apparatus, method of manufacturing a process cartridge, and method of remanufacturing a process cartridge | Physics | 27 | Active |
| US6512895B2 | Process cartridge and electrophotographic image forming system | Physics | 27 | Expired |
| US6144821A | Shutter member and process cartridge | Physics | 25 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.