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. Roland Corporation (2 from 477 patents)
2 patents:
1. 8835732 - Tone control device
2. 7732701 - Electronic musical instrument