Average Co-Inventor Count = 12.00
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. Transitions Optical, Inc. (1 from 216 patents)
2. Ppg Industries Ohio, Inc. (1,743 patents)
1 patent:
1. 12304991 - Photochromic article