Average Co-Inventor Count = 2.67
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. Hoya Corporation (4 from 2,528 patents)
4 patents:
1. 8785339 - Optical glass
2. 8716157 - Optical glass, glass material for press molding, and optical element
3. 8476178 - Optical glass
4. 7947617 - Optical glass, precision-pressmolding preform and optical element