HC

Hsi-Hsien Chen

EC Echowell Electronic Co.: 4 patents #1 of 1Top 100%
Overall (2020): #54,046 of 565,922Top 10%
4
Patents 2020

Issued Patents 2020

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
10856082 Audio system with sound-field-type nature sound effect — 2020-12-01
10755885 Vacuum tube rear device — 2020-08-25
D893460 Vacuum tube speaker — 2020-08-18
10727792 Vacuum tube and transistor amplifier natural sound field tone dividing system — 2020-07-28