Seiji Oka
59Patents
15h-index
94Co-inventors
87Inventor score
Filing activity: Feb 29, 1984 → Mar 21, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5109254A | Developing apparatus | Emerging Cross-Sectional Technologies | 69 | Expired |
| US5805965A | Developing device for an image forming apparatus having developer distribution features | Physics | 58 | Expired |
| US5659860A | Developing device for an image forming apparatus and toner cartridge | Physics | 56 | Expired |
| US5416568A | Developing unit for an image forming apparatus | Physics | 54 | Expired |
| US5771426A | Developing device using a toner and carrier mixture | Physics | 45 | Expired |
| US5983059A | Recyclable toner container for an image forming apparatus | Physics | 42 | Expired |
| US5235384A | Image forming apparatus with replaceable process units | Physics | 39 | Expired |
| US5822664A | Developing machine which uses a developing agent including a toner and magnetic particles | Physics | 38 | Expired |
| US4650070A | Toner cartridge | Emerging Cross-Sectional Technologies | 38 | Expired |
| US5758241A | Developing device for an image forming apparatus | Physics | 32 | Expired |
| US5771429A | Developing device capable of automatic toner content control | Physics | 25 | Expired |
| US4800411A | Magnetic brush development device for electrostatic latent images | Physics | 24 | Expired |
| US4799608A | Toner cartridge | Emerging Cross-Sectional Technologies | 22 | Expired |
| US5255059A | Image forming apparatus | Physics | 21 | Expired |
| US4969557A | Toner cartridge | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5077584A | Toner supply device for electrophotographic equipment | Emerging Cross-Sectional Technologies | 11 | Expired |
| US8436459B2 | Power semiconductor module | Electricity | 10 | Active |
| US6664127B2 | Method of manufacturing multi-layer printed wiring board | Emerging Cross-Sectional Technologies | 9 | Expired |
| US6108511A | Toner collecting and reusing device for use in an image forming apparatus and a method thereof | Physics | 8 | Expired |
| US8299601B2 | Power semiconductor module and manufacturing method thereof | Electricity | 8 | Active |
| US5555469A | Image forming apparatus having toner recycling device with electrostatic conveyor | Physics | 8 | Expired |
| US8502385B2 | Power semiconductor device | Electricity | 8 | Active |
| US6807072B2 | Electric power conversion device with push-pull circuitry | Electricity | 7 | Expired |
| US4591623A | Thermosetting resin composition | Chemistry; Metallurgy | 6 | Expired |
| US6451710B1 | Method of manufacturing multi-layer printed wiring board | Emerging Cross-Sectional Technologies | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.