Koyo Hasegawa
21Patents
12h-index
28Co-inventors
81Inventor score
Filing activity: Mar 30, 1989 → Mar 26, 2009
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5577266A | Broadcast system with associated data capabilities | Electricity | 232 | Expired |
| US5812937A | Broadcast data system with multiple-tuner receiver | Electricity | 194 | Expired |
| US7286825B2 | Method for communication among mobile units and vehicular communication apparatus | Electricity | 101 | Expired |
| US5946605A | Method and apparatus for communicating information using a data tuner | Electricity | 95 | Expired |
| US5485435A | Magnetic field generator in which an end face of a magnetic material member projects from man end face of magnetic field generating cores | Physics | 36 | Expired |
| US5398227A | Magnetooptical recording reproducing apparatus and method for determining the power of an irradiating light beam on the basis of a detected amplitude of a recording signal | Physics | 34 | Expired |
| US5428586A | Magneto-optical recording method using a magneto-optical recording medium having two or more magnetic layers to allow recording and reproduction to be effected simultaneously and magneto-optical recording medium used in the method | Physics | 33 | Expired |
| US5233578A | Method of recording information on a recording medium having at least two magnetic layers | Physics | 21 | Expired |
| US5661612A | Magnetic head driving device and magnetooptical recording apparatus | Electricity | 19 | Expired |
| US5717506A | Image communication apparatus for communicating binary and multi-value color image data | Electricity | 13 | Expired |
| US5051974A | Optical head device having a light splitter with a diffraction grating structure | Physics | 12 | Expired |
| US4896025A | Information reproducing apparatus for information recording medium having a plurality of information tracks | Physics | 12 | Expired |
| US5434831A | Magneto-optical recording apparatus capable of both magnetic modulation and light modulation recording | Physics | 11 | Expired |
| US5394380A | Magneto-optic recording apparatus and method therefor | Physics | 9 | Expired |
| US5293360A | Magnetic field generating device | Physics | 9 | Expired |
| US8457814B2 | Radar monitoring device | Physics | 6 | Active |
| US5668872A | Information processing method and system | Electricity | 5 | Expired |
| US4912311A | Information recording carrier | Physics | 5 | Expired |
| US5555236A | Magneto-optical recording method of erasing a portion of a first recording domain to form a crescent-shaped second recording domain | Physics | 3 | Expired |
| US7260108B2 | Multimedia information providing method and apparatus | Electricity | 2 | Expired |
| US5699433A | Subcarrier injection system and method using adaptive level-shifted minimum shift keying | General | 0 | Revoked |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.