Keiichi Murakami
106Patents
18h-index
117Co-inventors
89Inventor score
Filing activity: Jun 3, 1981 → Feb 9, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5857021A | Security system for protecting information stored in portable storage media | Physics | 150 | Expired |
| US5805800A | Apparatus and method for controlling storage medium using security capabilities | Physics | 52 | Expired |
| US5886979A | Information recording medium and method for recording and reproducing information to a medium to prevent unauthorized copying | Physics | 51 | Expired |
| US7421577B2 | Communication device, control method of communication device, program and communication method | Physics | 48 | Expired |
| US5491505A | Ink jet recording head and apparatus having a protective member formed above energy generators for generating energy used to discharge ink | Performing Operations; Transporting | 48 | Expired |
| US5228007A | Ultrasonic beam forming system | Physics | 41 | Expired |
| US4723553A | Ultrasound medium characteristics measuring apparatus | Physics | 39 | Expired |
| US5105816A | Method and system for making blood flow visible | Human Necessities | 38 | Expired |
| US4610255A | Ultrasonic non-linear parameter measuring system | Physics | 35 | Expired |
| US5611925A | Hub ring and supporting plate for a filter and methods for manufacturing these members | Emerging Cross-Sectional Technologies | 35 | Expired |
| US4648276A | Apparatus for measuring the characteristics of an ultrasonic wave medium | Physics | 31 | Expired |
| US4414850A | Measurement method and system utilizing ultrasonic wave | Physics | 25 | Expired |
| US4655228A | Ultrasonic diagnosis apparatus for tissue characterization | Physics | 24 | Expired |
| US6247131A | Information management method and recording medium | Physics | 23 | Expired |
| US6072675A | Control device for boring machine | Electricity | 21 | Expired |
| US5097836A | Untrasound diagnostic equipment for calculating and displaying integrated backscatter or scattering coefficients by using scattering power or scattering power spectrum of blood | Physics | 18 | Expired |
| US8266529B2 | Information processing device and display information editing method of information processing device | Electricity | 18 | Active |
| US6785403B1 | Method and system for inspecting a vehicle-mounted camera | Electricity | 18 | Expired |
| US5353797A | Ultrasonic diagnostic apparatus | Physics | 16 | Expired |
| US6885360B2 | Liquid crystal display device for use in electronic apparatus | Physics | 14 | Expired |
| US5649359A | Ink jet head manufacturing method using ion machining and ink jet head manufactured thereby | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5215093A | Ultrasonic color doppler diagnostic apparatus | Physics | 14 | Expired |
| US4413520A | Ultrasonic imaging apparatus | Physics | 13 | Expired |
| US5224480A | Ultrasonic imaging apparatus indicating dispersion of characteristic parameter of medium | Physics | 13 | Expired |
| US7248287B1 | Method for examining shooting direction of camera apparatus, device thereof and structure for installing sensor | Electricity | 12 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.