Average Co-Inventor Count = 2.53
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 (4 from 5,452 patents)
4 patents:
1. 8437618 - Content data recording apparatus with encryption by media ID
2. 8220065 - Content data reproducing apparatus with temporary data memory
3. 7498503 - Electronic music apparatus capable of connecting to network
4. 7482526 - Technique for supplying unique ID to electronic musical apparatus