Jun Hirai
73Patents
12h-index
57Co-inventors
87Inventor score
Filing activity: Feb 18, 1977 → Aug 20, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6266480A | Apparatus and method for effectively inhibiting unauthorized copying of picture signals which does not interfere with an authorized display thereof | Electricity | 82 | Expired |
| US6263506A | Data transmission and reception device and system, data transmission method and parameter setting method for data reception device | Electricity | 75 | Expired |
| US6324577A | Network management system for managing states of nodes | Electricity | 43 | Expired |
| US6115341A | Digital signal recording method and apparatus and digital signal reproduction method and apparatus | Electricity | 41 | Expired |
| US6850619B1 | COPYRIGHT PROTECTION METHOD, INFORMATION SIGNAL PROCESSING SYSTEM, INFORMATION SIGNAL OUTPUT APPARATUS, INFORMATION SIGNAL PROCESSING APPARATUS, INFORMATION SIGNAL OUTPUT METHOD, INFORMATION SIGNAL PROCESSING METHOD, AND INFORMATION SIGNAL RECORDING MEDIUM | Electricity | 38 | Expired |
| US5332916A | Transmission gate | Electricity | 22 | Expired |
| US5541999A | Audio apparatus having a karaoke function | Electricity | 19 | Expired |
| US4291330A | Video signal processing circuit for eliminating an interfering signal | Electricity | 18 | Expired |
| US7856143B2 | Unauthorized copy preventing device and method thereof, and program | Emerging Cross-Sectional Technologies | 18 | Active |
| US4513311A | Video signal processing unit | Electricity | 15 | Expired |
| US4134126A | Color recorder having means for reducing luminance crosstalk in displayed image | Electricity | 14 | Expired |
| US6222978A | Video signal copy guard apparatus and method | Electricity | 13 | Expired |
| US5915676A | Lever-type frictional resistance force variable system | Fixed Constructions | 12 | Expired |
| US6577805B1 | Picture recording and reproducing apparatus and method | Physics | 12 | Expired |
| US6238488A | Method of cleaning film forming apparatus, cleaning system for carrying out the same and film forming system | Chemistry; Metallurgy | 10 | Expired |
| US5914754A | Video signal aspect ratio conversion apparatus | Electricity | 10 | Expired |
| US6839503B1 | Transfer apparatus and recording control system using a transfer control method selected based on a transfer rate of data | Physics | 8 | Expired |
| US4290082A | Noise and cross-talk elimination in recording and reproducing video signals | Electricity | 8 | Expired |
| US7248784B1 | Signal conversion apparatus and method | Electricity | 8 | Expired |
| US8018516B2 | Solid-state image sensor and signal processing method of same | Electricity | 7 | Active |
| US4131912A | Apparatus for recording and reproducing video signals on a magnetic tape movable at different speeds | Electricity | 7 | Expired |
| US4165518A | Video signal recording and/or reproducing apparatus | Electricity | 7 | Expired |
| US7062068B2 | Data processing apparatus, data processing method, and program | Electricity | 7 | Expired |
| US5040082A | Recording apparatus | Electricity | 7 | Expired |
| US5168967A | Dynamic damper and method for detecting malfunction of dynamic damper | Fixed Constructions | 6 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.