Toko Co., Ltd.
249Patents
38Active
249Granted
44Portfolio score
Filing activity: Mar 13, 1974 → Jun 22, 2017 · 17 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4680528A | Battery charging device | Emerging Cross-Sectional Technologies | 167 | Expired |
| US5812045A | Inverter transformer | Electricity | 166 | Expired |
| USD322752S | Combined dispensing container and spreader for ski wax | General | 73 | Expired |
| US5959443A | Controller circuit for controlling a step down switching regulator operating in discontinuous conduction mode | Electricity | 69 | Expired |
| US5359313A | Step-up transformer | Electricity | 65 | Expired |
| US6462509B1 | Non-contact charger | Electricity | 55 | Expired |
| US7132905B2 | Input/output coupling structure for dielectric waveguide having conductive coupling patterns separated by a spacer | Electricity | 45 | Expired |
| US6677837B2 | Dielectric waveguide filter and mounting structure thereof | Electricity | 45 | Expired |
| US5999066A | Interface module for a sending section and a receiving section | Electricity | 45 | Expired |
| US5515257A | AC-DC converter | Emerging Cross-Sectional Technologies | 35 | Expired |
| US7042411B2 | Triaxial antenna coil | Electricity | 34 | Expired |
| US5111372A | DC-DC converter | Electricity | 34 | Expired |
| US4506238A | Hybrid circuit device | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5440473A | AC-DC converter | Emerging Cross-Sectional Technologies | 31 | Expired |
| US5991313A | Video transmission apparatus | Electricity | 31 | Expired |
| US5680034A | PWM controller for resonant converters | Emerging Cross-Sectional Technologies | 30 | Expired |
| US4629962A | Battery charging device | Emerging Cross-Sectional Technologies | 30 | Expired |
| US6977560B2 | Input/output coupling structure for dielectric waveguide resonator | Electricity | 29 | Expired |
| US4263643A | Switching regulator provided with error amplifier circuit having overcurrent protecting function | Electricity | 28 | Expired |
| US4430595A | Piezo-electric push button switch | Electricity | 28 | Expired |
| US5457622A | AC-DC converter | Emerging Cross-Sectional Technologies | 27 | Expired |
| US4814724A | Gain control circuit of current mirror circuit type | Electricity | 26 | Expired |
| US5689178A | Self-oscillation type DC-DC converter having a driving transistor connected in parallel to a circuit element for starting a switching element | Electricity | 25 | Expired |
| US5589884A | Adaptive quantization controlled by scene change detection | Electricity | 23 | Expired |
| US4449175A | Switching regulator | Electricity | 23 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.