Average Co-Inventor Count = 6.00
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. Seiko Epson Corporation (2 from 33,490 patents)
2 patents:
1. 5504735 - Information recording disk having a stepped central recess and hub
2. 5265086 - Information recording disk