Seiichi Miyakawa
37Patents
15h-index
55Co-inventors
84Inventor score
Filing activity: May 7, 1975 → Sep 27, 1996
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4231561A | Auto document feeder for use with duplex copying machine | Physics | 84 | Expired |
| US4215930A | Method of maintaining the correct conditions of an electrophotographically duplicated image | Physics | 49 | Expired |
| US4226525A | Electrostatic copying machine | Emerging Cross-Sectional Technologies | 46 | Expired |
| US4194830A | Development apparatus | Physics | 41 | Expired |
| US5666616A | Wet-type image forming apparatus for forming a condensed toner image | Physics | 38 | Expired |
| US4050806A | Method and apparatus for electrically biasing developing electrode of electrophotographic device | Emerging Cross-Sectional Technologies | 31 | Expired |
| US4382420A | Development apparatus | Physics | 28 | Expired |
| US4306804A | Exposure control and other component control for electrostatic copying machine | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4142165A | Electrostatic copying machine comprising improved magnetic brush developing-cleaning unit | Physics | 25 | Expired |
| US4286543A | Apparatus for developing electrostatic image | Physics | 25 | Expired |
| US4310238A | Electrostatic copying apparatus | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5864737A | Image forming device which forms an electric field to discharge an object | Physics | 21 | Expired |
| US4195260A | Apparatus for sensing deterioration of developing substance including ferromagnetic carrier and non-magnetic toner particles | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4251152A | Electrostatic apparatus for multi-image formation | Physics | 18 | Expired |
| US4218130A | Method for controlling a copying apparatus adapted to print images on opposite surfaces of a copy sheet | Physics | 16 | Expired |
| US4210864A | Apparatus for sensing toner density using a stationary ferromagnetic mass within the toner to increase sensitivity | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4166702A | Device for detecting a toner concentration in a developing solution | Physics | 14 | Expired |
| US4350749A | Reverse development method | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4423134A | Developing unit for electrophotography | Physics | 11 | Expired |
| US4669859A | Developing device | Physics | 11 | Expired |
| US4168329A | Auto-bias developing process and an electrophotographic copying machine | Physics | 10 | Expired |
| US4803593A | Flat solid discharging device | Physics | 10 | Expired |
| US5247334A | Image formation method and apparatus with preheating and pressure image transfer with liquid toner development | Physics | 9 | Expired |
| US5172180A | Image forming equipment with variable stepwise drive means operation | Electricity | 9 | Expired |
| US4165172A | Drum cleaning system for electrophotographic apparatus | Physics | 8 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.