Keisuke Hirai
38Patents
8h-index
37Co-inventors
75Inventor score
Filing activity: Oct 8, 1986 → Sep 8, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5706617A | Roof system utilizing a solar cell | Emerging Cross-Sectional Technologies | 109 | Expired |
| US5497587A | Roof system utilizing a solar cell | Emerging Cross-Sectional Technologies | 91 | Expired |
| US6271266A | Use of idebenone and analogues against .beta. amyloid induced cytotoxicity | Human Necessities | 27 | Expired |
| US5367843A | Roof apparatus | Emerging Cross-Sectional Technologies | 25 | Expired |
| US7341564B2 | Biopsy forceps device with transparent outer sheath | Human Necessities | 17 | Expired |
| US5527800A | Tricyclic condensed heterocyclic compounds, their production and use | Chemistry; Metallurgy | 15 | Expired |
| US6009807A | Printing apparatus | Performing Operations; Transporting | 13 | Expired |
| US5810526A | Lubricant application apparatus in a gravure engraving machine | Emerging Cross-Sectional Technologies | 10 | Expired |
| US7417683B2 | Auto-focusing optical apparatus with focus detection area setting capability | Electricity | 7 | Expired |
| US8579286B2 | Image recording device | Physics | 7 | Active |
| US6837490B2 | Paper feeding apparatus | Performing Operations; Transporting | 6 | Expired |
| US5822078A | System for engraving a plurality of gravure rolls | Emerging Cross-Sectional Technologies | 5 | Expired |
| US8289442B2 | Television camera system and television lens apparatus | Electricity | 3 | Active |
| US8677519B2 | Drainage connector | Fixed Constructions | 3 | Active |
| US7808547B2 | Lens apparatus and image-taking apparatus including drive range limiting function having valid and invalid states | Electricity | 3 | Active |
| US8054366B2 | Auto-focusing optical apparatus with focus detection area setting capability and focus detection area changing capability | Electricity | 3 | Active |
| US7218849B2 | Lens device having a controller for controlling optical elements and photographing apparatus including the lens device | Physics | 2 | Expired |
| US6318256A | Printing apparatus | Performing Operations; Transporting | 2 | Expired |
| US7262803B2 | Camera with adjustable auto-focus detection area | Electricity | 2 | Expired |
| US5686466A | Tricyclic condensed heterocyclic compounds their production and use | Chemistry; Metallurgy | 2 | Expired |
| US7265914B2 | Lens device and photographing apparatus including the same | Physics | 1 | Expired |
| US8070286B2 | Image recording apparatus | Performing Operations; Transporting | 1 | Active |
| US6988724B2 | Sheet-fed printing apparatus | Performing Operations; Transporting | 1 | Expired |
| US8436933B2 | Image pickup system and lens apparatus | Electricity | 1 | Active |
| US11453227B2 | Drying apparatus, printing system and drying method that inject hot wind from nozzles to surface of recording medium | Performing Operations; Transporting | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.