FOSTER ELECTRIC COMPANY, LIMITED
63Patents
39Active
63Granted
46Portfolio score
Filing activity: Jan 2, 1975 → Dec 5, 2022 · 6 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| USD718284S1 | Earphone | General | 124 | Active |
| USD668244S1 | Headphone | General | 65 | Active |
| USD718285S1 | Earphone | General | 54 | Active |
| US5142587A | Intra-concha type electroacoustic transducer for use with audio devices etc. | Electricity | 45 | Expired |
| US3997739A | Electrodynamic type electroacoustic transducer | Electricity | 40 | Expired |
| US6516077B1 | Electroacoustic transducer | Electricity | 34 | Expired |
| USD726165S1 | Earphone | General | 29 | Active |
| US6845166B2 | Plane driving type electroacoustic transducer | Electricity | 24 | Expired |
| USD909344S1 | Earphones | General | 23 | Active |
| US5371806A | Loudspeaker | Electricity | 21 | Expired |
| US5003609A | Whole-surface driven speaker | Electricity | 19 | Expired |
| US5740264A | Miniature electroacoustic transducer | Electricity | 19 | Expired |
| US5619019A | Damper for loudspeaker | Electricity | 18 | Expired |
| US9980032B2 | Earphone device and sound-reproducing system using the same | Electricity | 17 | Active |
| US5740265A | Loudspeaker unit and loudspeaker system employing the unit | Electricity | 17 | Expired |
| US5705108A | Method for making edge for loudspeaker diaphragm | Electricity | 13 | Expired |
| US5511131A | Loudspeaker | Electricity | 11 | Expired |
| US6183674A | Manufacturing method of diaphragm for use in electroacoustic transducers | Electricity | 10 | Expired |
| US6899794B1 | Speaker device, and method and device for producing the same | Electricity | 8 | Expired |
| US7184567B2 | Thin speaker and method of manufacturing the speaker | Electricity | 7 | Expired |
| USD821361S1 | Actuator | General | 7 | Active |
| USD897984S1 | Headphone | General | 6 | Active |
| USD761233S1 | Earphone | General | 6 | Active |
| US6134337A | Loudspeaker | Electricity | 6 | Expired |
| US8155344B2 | Vehicle speaker | Performing Operations; Transporting | 5 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.