Hitachi Denshi Kabushiki Kaisha
212Patents
1Active
212Granted
43Portfolio score
Filing activity: Jan 28, 1976 → Jun 9, 2003 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5203028A | Automatic adjustment radio apparatus | Electricity | 220 | Expired |
| US6154601A | Method for editing image information with aid of computer and editing system | Physics | 175 | Expired |
| US5282045A | Depth-of-field control apparatus and image pickup apparatus having the same therein | Electricity | 121 | Expired |
| US6687386B1 | Object tracking method and object tracking apparatus | Physics | 108 | Expired |
| US6445409B1 | Method of distinguishing a moving object and apparatus of tracking and monitoring a moving object | Electricity | 106 | Expired |
| US5926065A | Digital modulator having a digital filter including low-speed circuit components | Electricity | 102 | Expired |
| US6754367B1 | Method and apparatus for automatically detecting intrusion object into view of image pickup device | Physics | 84 | Expired |
| US4511990A | Digital processor with floating point multiplier and adder suitable for digital signal processing | Physics | 81 | Expired |
| US6404455B1 | Method for tracking entering object and apparatus for tracking and monitoring entering object | Electricity | 75 | Expired |
| US6526215B2 | Apparatus for editing moving picture having a related information thereof, a method of the same and recording medium for storing procedures in the same method | Physics | 73 | Expired |
| US5438305A | High frequency module including a flexible substrate | Electricity | 72 | Expired |
| US4158149A | Electronic switching circuit using junction type field-effect transistor | Electricity | 72 | Expired |
| US4377787A | System for measuring state of charge of storage battery | Physics | 70 | Expired |
| US5579434A | Speech signal bandwidth compression and expansion apparatus, and bandwidth compressing speech signal transmission method, and reproducing method | Physics | 66 | Expired |
| US6304611A | OFDM modulator and OFDM modulation method for digital modulated wave having guard interval | Electricity | 65 | Expired |
| US6115037A | Motion image control method and apparatus | Physics | 63 | Expired |
| US6466260B1 | Traffic surveillance system | Physics | 59 | Expired |
| US5978651A | Method for bidirectionally transmitting digital video signal and digital video signal bidirectional transmission system | Electricity | 58 | Expired |
| US4296436A | Noise reducing system | Electricity | 56 | Expired |
| US6747694B1 | Television signal processor for generating video signal of wide dynamic range, television camera using the same, and method for television signal processing | Electricity | 56 | Expired |
| US5671010A | Apparatus for judging the order of arrival of racers at a goal in a race and the time taken for the race, having a plurality of line sensor cameras | Physics | 56 | Expired |
| US5912544A | Electronic equipment and method for enabling plural types of batteries to be selectively used | Electricity | 54 | Expired |
| US4792939A | Duplex radio communication transceiver | Electricity | 52 | Expired |
| US4156237A | Colored display system for displaying colored planar figures | Physics | 51 | Expired |
| US6512798B1 | Digital communication system of orthogonal modulation type | Electricity | 49 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.