EM-TECH Co., Ltd
64Patents
60Active
64Granted
54Portfolio score
Filing activity: Nov 20, 2000 → Aug 30, 2023 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8987951B2 | Linear vibrator | Electricity | 44 | Active |
| US6553838B2 | Detection of anomalies on railroad tracks | Performing Operations; Transporting | 22 | Expired |
| US9832557B2 | Slim microspeaker | Electricity | 10 | Active |
| US8794374B2 | Acoustic transducer device | Electricity | 10 | Active |
| US9025808B2 | High-output microspeaker | Electricity | 9 | Active |
| US11381898B2 | Canal-type earphone having pressure equilibrium structure | Electricity | 7 | Active |
| US6392421B1 | Spectral EM frequency metallic thickness measurement using metallic transparencies | Physics | 6 | Expired |
| US10728672B2 | Sound converter | Electricity | 6 | Active |
| US9027700B2 | Bonding structure of diaphragm for microspeaker | Electricity | 6 | Active |
| US10057678B2 | Microspeaker enclosure with air adsorbent in resonance space | Electricity | 5 | Active |
| US9185494B2 | Inner magnet type microspeaker | Electricity | 4 | Active |
| US9473837B2 | Sound transducer with ventilation structure | Electricity | 3 | Active |
| US6351245B1 | Use of phase coded permeability lensing to obtain directional information in electro-magnetic radiation | Electricity | 3 | Expired |
| US11336983B1 | Receiver module having pressure equilibrium structure | Electricity | 2 | Active |
| US8150076B2 | Sound converter with enclosure | Electricity | 2 | Active |
| US11395060B2 | Receiver having pressure equilibrium structure | Electricity | 1 | Active |
| US11206500B2 | Bone conduction speaker | Electricity | 1 | Active |
| US10419848B2 | Microspeaker enclosure with porous materials in resonance space | Electricity | 1 | Active |
| US11696059B2 | Two-way receiver having front bass duct | Electricity | 1 | Active |
| US11425487B2 | Translation system using sound vibration microphone | Electricity | 1 | Active |
| US9900703B2 | Suspension for high power micro speaker and high power micro speaker having the same | Electricity | 1 | Active |
| US10419847B2 | Microspeaker enclosure with porous materials in resonance space | Electricity | 1 | Active |
| US11564026B2 | Earphone having pressure equilibrium structure | Electricity | 1 | Active |
| US10899577B2 | Automatic winding device | Electricity | 1 | Active |
| US10298105B2 | Linear vibrator | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.