Average Co-Inventor Count = 4.00
ph-index = 4
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 (4 from 5,452 patents)
4 patents:
1. 7574364 - Contents rating method
2. 7567910 - Method of validating entrance to event site
3. 7087829 - Method, system and recording medium for viewing/listening evaluation of musical performance
4. 6583348 - Server for use in rating of music contents