Koichi Oka
22Patents
6h-index
44Co-inventors
69Inventor score
Filing activity: Dec 28, 1983 → Oct 9, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5564519A | Four-wheel traveling system for tipper | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US5015094A | Particle size measuring system | Physics | 21 | Expired |
| US5183045A | NMR measuring method and measuring apparatus for tissue of a living body | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5157454A | Differential refractometer | Physics | 8 | Expired |
| US4553734A | Finger pressure actuable dump control system for dump vehicles | Performing Operations; Transporting | 7 | Expired |
| US7483550B2 | Method and system for evaluating moving image quality of displays | Physics | 6 | Expired |
| US4664723A | Samarium-cobalt type magnet powder for resin magnet | Electricity | 6 | Expired |
| US4689073A | Method for production of rare-earth element/cobalt type magnetic powder for resin magnet | Electricity | 6 | Expired |
| US6636308B1 | Apparatus for measuring characteristics of optical angle | Physics | 5 | Expired |
| US7176464B2 | Method of and apparatus for determining the amount of impurity in gas | Physics | 5 | Expired |
| US8552574B2 | Cogeneration apparatus | Emerging Cross-Sectional Technologies | 4 | Active |
| US4865660A | Rare-earth element/cobalt type magnet powder for resin magnets | Electricity | 4 | Expired |
| US5113083A | Light scattering measuring apparatus utilizing a photodetector mounted on a rotary stand | Physics | 3 | Expired |
| US7394483B2 | Display evaluation method and apparatus | Physics | 3 | Active |
| US7847819B2 | Measurement system for evaluating moving image quality of displays | Electricity | 2 | Active |
| US5337474A | Process for fabricating electronic devices and image sensor | Emerging Cross-Sectional Technologies | 2 | Expired |
| US8388392B2 | Steering device for outboard engine | Performing Operations; Transporting | 1 | Active |
| US8794169B2 | Power steering apparatus for small vessel | Performing Operations; Transporting | 1 | Active |
| US7251035B2 | Optical cell measurement apparatus | Physics | 0 | Expired |
| US8393925B2 | Steering device for outboard engine | Performing Operations; Transporting | 0 | Active |
| US8893472B2 | Cogeneration apparatus | Emerging Cross-Sectional Technologies | 0 | Active |
| US9413206B2 | Cogeneration apparatus | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.