Average Co-Inventor Count = 2.00
ph-index = 3
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 (3 from 5,452 patents)
3 patents:
1. D771600 - Microphone
2. D751527 - Sound control device with speaker
3. D743383 - Microphone