JAPAN RADIO CO., LTD.
92Patents
21Active
92Granted
43Portfolio score
Filing activity: Jun 15, 1977 → Jan 31, 2022 · 6 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4903212A | GPS/self-contained combination type navigation system | Physics | 304 | Expired |
| US6101378A | Pre-paid cellular telephone system | Electricity | 233 | Expired |
| USD401592S | Antenna radome | General | 83 | Expired |
| US5383223A | Power control device wherein a bias voltage in level detection is given a constant difference from a detected voltage | Electricity | 77 | Expired |
| US5818283A | High power FET switch | Electricity | 71 | Expired |
| US5402441A | Signal receiver for global positioning system | Physics | 51 | Expired |
| US4318100A | Automatic ground clutter rejection in weather pulse radar system | Emerging Cross-Sectional Technologies | 44 | Expired |
| US5499268A | Adaptive equalizer capable of compensating for carrier frequency offset | Electricity | 43 | Expired |
| US5507023A | Receiver with an AGC circuit capable of expanding a dynamic range | Electricity | 41 | Expired |
| US5227806A | Stabilized ship antenna system for satellite communication | Electricity | 39 | Expired |
| US5252882A | Surface acoustic wave device and its manufacturing method | Emerging Cross-Sectional Technologies | 36 | Expired |
| US5031308A | Method of manufacturing multilayered printed-wiring-board | Emerging Cross-Sectional Technologies | 35 | Expired |
| USD401594S | Navigation antenna | General | 34 | Expired |
| USD401593S | Navigation antenna | General | 29 | Expired |
| US5359337A | Stabilized antenna system | Electricity | 29 | Expired |
| US5521453A | Surface acoustic wave filter and mobile communication system using same | Electricity | 29 | Expired |
| US5594460A | Tracking array antenna system | Electricity | 29 | Expired |
| USD389757S | Radar display unit | General | 27 | Expired |
| US5511215A | Debugging system for the loading and execution of data flow programs | Physics | 27 | Expired |
| US6321444A | Method of making surface acoustic wave device | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5223845A | Array antenna and stabilized antenna system | Electricity | 24 | Expired |
| US5097220A | Circuit for demodulating PSK modulated signal by differential-defection | Electricity | 23 | Expired |
| US5471722A | Method of manufacturing a surface acoustic wave | Emerging Cross-Sectional Technologies | 22 | Expired |
| US5241567A | Circuit for demodulating PSK modulation signals | Electricity | 22 | Expired |
| US6522301B2 | Above deck unit for automatic identification system | Physics | 22 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.