Average Co-Inventor Count = 3.98
ph-index = 2
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 58,129 patents)
3 patents:
1. 7663999 - Disc drive apparatus and electronic appliance
2. 7487520 - Disc drive apparatus with disc chucking arrangement
3. 7409695 - Disc drive apparatus