Average Co-Inventor Count = 1.33
ph-index = 5
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. Yamaha Corporation (5 from 5,451 patents)
2. Nakamichi Corporation (2 from 142 patents)
3. Sony Corporation (1 from 58,130 patents)
8 patents:
1. D692862 - Speaker
2. D682247 - Relay device
3. 8282054 - Stand for portable electronic device
4. 7850484 - Connecting apparatus for connecting to an electronic apparatus
5. D574810 - Speaker
6. D430128 - Wireless telephone
7. D322252 - Audio amplifier
8. D320989 - Digital audio disk player