Average Co-Inventor Count = 1.20
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 (6 from 5,451 patents)
6 patents:
1. D930739 - Lamp with keyboard
2. D827018 - Piano
3. D823333 - Display screen with graphical user interface
4. D820903 - Electric bass
5. D818035 - Electric bass
6. D778351 - Electric guitar