Average Co-Inventor Count = 2.67
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 5,451 patents)
2 patents:
1. 7328272 - Apparatus and method for adding music content to visual content delivered via communication network
2. 7202407 - Tone material editing apparatus and tone material editing program