Average Co-Inventor Count = 1.67
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. Zumtobel Staff Gmbh (1 from 29 patents)
2. Zumtobel Aktiengesellschaft (1 from 8 patents)
2 patents:
1. D401375 - Ceiling light exterior
2. 4680684 - Bed reading lamp, particularly for hospital beds