Average Co-Inventor Count = 1.33
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. Roland Corporation (2 from 477 patents)
2 patents:
1. 6822148 - Electronic pad
2. D455775 - Electronic high-hat cymbal