Average Co-Inventor Count = 3.00
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. Sony Corporation (3 from 58,132 patents)
3 patents:
1. D877713 - Headphone
2. 10582281 - Speaker grille and speaker device
3. D821998 - Headphone