FDK CORPORATION
206Patents
140Active
206Granted
53Portfolio score
Filing activity: Apr 21, 1995 → Mar 22, 2023 · 10 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7072191B2 | Switching power source circuit for independent per cycle control of ON/OFF time ratio | Emerging Cross-Sectional Technologies | 51 | Expired |
| USD833384S1 | Battery holder | General | 50 | Active |
| USD521166S1 | Flash light | General | 49 | Expired |
| USD464454S1 | Portable lamp | General | 45 | Expired |
| US7173182B2 | Signal transmission cable with connector | Electricity | 42 | Expired |
| USD465045S1 | Flashlight | General | 32 | Expired |
| USD866312S1 | Packaging for batteries | General | 32 | Active |
| US5821008A | Battery provided with explosion-proof components | Emerging Cross-Sectional Technologies | 29 | Expired |
| US6262651A | Coil device | Electricity | 23 | Expired |
| US6452473B1 | Multilayer inductor and method of manufacturing the same | Electricity | 23 | Expired |
| US5521741A | Polarization plane switch and optical switching device using the same | Physics | 23 | Expired |
| US5929603A | Apparatus for preventing over-discharge | Electricity | 21 | Expired |
| USD500377S1 | Headlamp | General | 20 | Expired |
| US6023214A | Sheet transformer | Electricity | 20 | Expired |
| US6556117B1 | Multi-channel uniform output type transformer | Electricity | 16 | Expired |
| US6072702A | Ringing choke converter | Electricity | 16 | Expired |
| USD866311S1 | Packaging for batteries | General | 14 | Active |
| US8692515B2 | Series-connected rechargeable cells, series-connected rechargeable cell device, voltage-balance correcting circuit for series-connected cells | Emerging Cross-Sectional Technologies | 13 | Active |
| USD479014S1 | Flashlight | General | 12 | Expired |
| US6885278B2 | Microconverter and laminated magnetic-core inductor | Emerging Cross-Sectional Technologies | 12 | Expired |
| US6270833A | Separator for an alkaline cell and a method of producing the separator | Emerging Cross-Sectional Technologies | 11 | Expired |
| US7243117B2 | Random number generator and probability generator | Physics | 9 | Expired |
| US5982264A | High frequency sheet-type transformer | Electricity | 9 | Expired |
| US7605682B2 | Magnetic core type laminated inductor | Electricity | 9 | Expired |
| US5661394A | Switching power supply | Emerging Cross-Sectional Technologies | 8 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.