Kohei Ota
58Patents
10h-index
42Co-inventors
78Inventor score
Filing activity: Oct 4, 1985 → Aug 28, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6404562B1 | Zoom lens | Physics | 43 | Expired |
| US6870805B1 | Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method | Physics | 41 | Expired |
| US6429972B1 | Diffraction lens | Physics | 38 | Expired |
| US6411442B1 | Objective lens for pickup and light pickup apparatus | Physics | 32 | Expired |
| US6185050A | Zoom lens having two lens groups | Physics | 24 | Expired |
| US6898168B2 | Optical pick-up apparatus | Physics | 22 | Expired |
| US6671247B1 | Optical pick-up apparatus, optical element, and objective lens having diffracting section | Physics | 21 | Expired |
| US6950384B2 | Optical pickup appratus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method | Physics | 21 | Expired |
| US6687209B2 | Optical pickup apparatus, objective lens, apparatus for reproducing and/or recording optical information recording medium | Physics | 12 | Expired |
| US4726666A | Two-group zoom lens | Physics | 12 | Expired |
| US9239392B2 | Radiographic imaging device | Electricity | 10 | Active |
| US6349083B1 | Near field type optical disk recording reproducing apparatus, optical information recording medium recording reproducing apparatus, pickup apparatus, objective lens | Physics | 8 | Expired |
| US6512640B2 | Objective lens for pickup and light pickup apparatus | Physics | 8 | Expired |
| US7164625B2 | Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method | Physics | 7 | Expired |
| US7151735B2 | Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method | Physics | 7 | Expired |
| US6747812B2 | Objective lens for optical pick-up apparatus and optical pick-up apparatus | Physics | 6 | Expired |
| US7672212B2 | Optical pickup apparatus, objective optical element and optical information recording reproducing apparatus | Physics | 5 | Active |
| US7656770B2 | Optical pickup apparatus, objective optical element and optical information recording reproducing apparatus | Physics | 5 | Active |
| US6728042B2 | Optical pick-up device and objective lens used therein | Physics | 5 | Expired |
| US7843793B2 | Optical pickup apparatus, objective optical element and optical information recording reproducing apparatus | Physics | 5 | Active |
| US7075880B2 | Optical pick-up device and objective lens used therein | Physics | 3 | Expired |
| US7508745B2 | Optical element having a refractive function and an optical path difference providing function | Physics | 3 | Expired |
| US7366078B2 | Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method | Physics | 3 | Expired |
| US7440381B2 | Optical pick-up apparatus | Physics | 3 | Expired |
| US7668066B2 | Optical pickup apparatus | Physics | 3 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.