Average Co-Inventor Count = 3.69
ph-index = 4
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. (3 from 4,208 patents)
2. American Telephone and Telegraph, Co. (1 from 386 patents)
3. At&t Information Systems Inc. (1 from 243 patents)
4 patents:
1. 5778052 - Method and system for storing messages for later forwarding
2. 5544229 - System for providing personalized telephone calling features
3. 5384831 - System for providing personalized telephone calling features
4. 4870679 - Repertory telephone dialer with remote billing capability