Austin, Texas
United States
3
2021-03-11
The entities that hold a legal rights for patent applications filed by inventor Cheng Frank:
Frank Cheng from Austin, US has applied for patents for these inventions. The list has both pending applications and granted patents:
Apparatus and method for measuring speaker transducer impedance versus frequency with ultralow inaudible signal
#2 | 2018-09-06Digital PWM modulator
#3 | 2014-10-02Asymmetrically-switched modulation scheme
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