Average Co-Inventor Count = 4.00
ph-index = 2
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 (2 from 5,450 patents)
2 patents:
1. 7528318 - Musical tone control apparatus and method
2. 7297862 - Musical tone control apparatus and method