Average Co-Inventor Count = 2.67
ph-index = 1
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 (2 from 5,450 patents)
2 patents:
1. 11568839 - Performance support device and air reed instrument
2. 7049503 - Hybrid wind instrument selectively producing acoustic tones and electric tones and electronic system used therein