Average Co-Inventor Count = 2.40
ph-index = 3
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. Pioneer Corporation (3 from 2,646 patents)
2. Tohoku Pioneer Corporation (1 from 291 patents)
3. Pioneer Design Corporation (1 from 9 patents)
3 patents:
1. 7284637 - Low-frequency sound reproducing speaker apparatus
2. D487738 - Speaker
3. D487076 - Speaker