HC

Hsi-Hsien Chen

EC Echowell Electronic Co.: 3 patents #1 of 1Top 100%
Overall (2021): #80,678 of 548,734Top 15%
3
Patents 2021

Issued Patents 2021

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
11121678 Vacuum tube amplification system capable of reducing residual noise and a grounding method thereof — 2021-09-14
10938364 Vacuum tube subwoofer extraction circuit system — 2021-03-02
10924854 Three-piece extensible movable soundbox — 2021-02-16