Average Co-Inventor Count = 3.43
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 (2 from 5,451 patents)
2 patents:
1. 9646593 - Up/down motion detecting apparatus for hi-hat and an electronic percussion instrument including the apparatus
2. 8461445 - Electronic percussion instrument having groupable playing pads