IP Library › Granted Patent US 11,540,057
Granted Patent Utility
US 11,540,057 · Confirmation No. 4889

BONE CONDUCTION SPEAKER AND COMPOUND VIBRATION DEVICE THEREOF

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Quick Facts
Patent No.
US 11,540,057
App. No.
17/218,549
Filed
2021-03-31
Granted
2022-12-27
Pub. No.
US20210281954A1
Examiner
YU, NORMAN
Art Unit
2652
PTA
-40 days