Average Co-Inventor Count = 1.89
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. Porta Systems Corporation (3 from 141 patents)
3 patents:
1. D326266 - Power transfer block for telephone systems or similar device
2. 4581493 - Line condition reporting system
3. D276333 - Telephone transfer relay unit