Average Co-Inventor Count = 2.57
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. Sennheiser Electronic Gmbh & Co Kg (3 from 296 patents)
3 patents:
1. D881156 - Sound amplifier
2. D868029 - Headphones
3. D849713 - Headphones