Average Co-Inventor Count = 2.57
ph-index = 3
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. Wella Aktiengesellschaft (3 from 433 patents)
3 patents:
1. 4840639 - Agent for dyeing hair
2. 4452603 - Process for dyeing hair and composition therefor
3. 3973900 - Hair dye