Average Co-Inventor Count = 3.60
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 58,131 patents)
3 patents:
1. 6770167 - Production method of and production apparatus for optical recording disc
2. 6702920 - Production method of and production apparatus for optical recording disc
3. 6478908 - Production method of and production apparatus for optical recording disc