SANKEN ELECTRIC CO., LTD.
649Patents
452Active
649Granted
57Portfolio score
Filing activity: Jan 31, 1975 → Jul 5, 2023 · 202 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7323723B2 | Semiconductor light-emitting device using phosphors for performing wavelength conversion | Electricity | 224 | Expired |
| US6519165B2 | Dc-to-dc converter | Emerging Cross-Sectional Technologies | 183 | Expired |
| US6319425A | Transparent coating member for light-emitting diodes and a fluorescent color light source | Electricity | 121 | Expired |
| US6714425B2 | Power factor corrected SMPS with light and heavy load control modes | Emerging Cross-Sectional Technologies | 106 | Expired |
| US6472765B1 | Plastic encapsulated semiconductor light emitting device with a cover of fluorescent particles | Electricity | 90 | Expired |
| US6545457B2 | Current detector utilizing hall effect | Electricity | 85 | Expired |
| US6462531B1 | Current detector having a hall-effect device | Electricity | 83 | Expired |
| US6842350B2 | Dc-to-dc converter with flyback period detector circuit | Electricity | 81 | Expired |
| US6683448B1 | Large current detector having a hall-effect device | Electricity | 80 | Expired |
| US6424018B1 | Semiconductor device having a hall-effect element | Electricity | 78 | Expired |
| US6947298B2 | Switching power source apparatus | Electricity | 72 | Expired |
| US6515876B2 | Dc-to-dc converter | Emerging Cross-Sectional Technologies | 68 | Expired |
| US6980446B2 | Circuit for starting power source apparatus | Emerging Cross-Sectional Technologies | 68 | Expired |
| US6841989B2 | Hall-effect current detector | Electricity | 66 | Expired |
| US7768801B2 | Current resonant DC-DC converter of multi-output type | Emerging Cross-Sectional Technologies | 63 | Active |
| US7035119B2 | Switching power source device | Electricity | 63 | Expired |
| US7120036B2 | Switching-mode power supply having a synchronous rectifier | Emerging Cross-Sectional Technologies | 61 | Expired |
| US6759841B2 | Hall-effect current detector | Electricity | 61 | Expired |
| US6727683B2 | Hall-effect current detector | Electricity | 60 | Expired |
| US6680490B2 | Light-emitting device | Electricity | 59 | Expired |
| US6812687B1 | Semiconductor current detector of improved noise immunity | Electricity | 59 | Expired |
| US7714360B2 | Surface-stabilized semiconductor device | Electricity | 57 | Active |
| US6989665B2 | Electric current detector with hall effect sensor | Physics | 55 | Expired |
| US6445598B1 | Dc-dc converter | Emerging Cross-Sectional Technologies | 55 | Expired |
| US7777254B2 | Normally-off field-effect semiconductor device | Electricity | 53 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.