Average Co-Inventor Count = 7.00
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. At+t Corp. (2 from 4,208 patents)
2 patents:
1. 5694459 - Personalized information service system
2. 5444713 - Telephone information service system using digital and out-of-band