Average Co-Inventor Count = 3.27
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 (3 from 477 patents)
2. Karimoku Furniture Inc. (1 from 1 patent)
3 patents:
1. D1096922 - Piano
2. D1064053 - Electronic keyboard instrument
3. D774127 - Electronic piano