Average Co-Inventor Count = 6.15
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 (2 from 58,130 patents)
2 patents:
1. D433407 - Drum for video tape recorder
2. 4773057 - Apparatus for reproducing selectively loaded discs of different diameters