Average Co-Inventor Count = 1.29
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. 7639832 - Headphones
2. D582341 - Rechargeable battery
3. D540311 - Headphone container