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 5,451 patents)
3 patents:
1. 6582235 - Method and apparatus for displaying music piece data such as lyrics and chord data
2. 6504090 - Apparatus and method for practice and evaluation of musical performance of chords
3. 6346666 - Apparatus and method for practice and evaluation of musical performance of chords