Patents
.us
Search
Marketplace
Patent My Idea
Patents
/
Inventors
Takayuki Karasawa
Taichung
TW
1 patent
2 Patents
US11800272
2023
Headphone Device
ASIA OPTICAL CO., Inc.
0 cites
US11735154
2023
Earpiece Device
ASIA OPTICAL CO., Inc.
0 cites