Average Co-Inventor Count = 1.41
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. 7683250 - Electronic musical apparatus
2. 7319187 - Tone generation control program and electronic keyboard instrument using the tone generation control program
3. 7297861 - Automatic performance apparatus and method, and program therefor
4. 7026538 - Tone generation apparatus to which plug-in board is removably attachable and tone generation method therefor