Average Co-Inventor Count = 1.33
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. Durst Ag Fabrik Fototechnischer Apparate (1 from 16 patents)
2. Durst Phototechnik Gmbh (1 from 8 patents)
2 patents:
1. 4728992 - Process and a device for adjusting a photographic color enlarging or
2. D271774 - Photographic enlarging apparatus