Average Co-Inventor Count = 1.50
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. Essilor International Cie Generale D'optique (2 from 87 patents)
2 patents:
1. 4279480 - Ophthalmic lens having an aspheric surface
2. 3978741 - Variable-profile cam, especially for a reproducing machine