Average Co-Inventor Count = 1.83
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. AT&T Intellectual Property I, LP (1 from 16,492 patents)
3. Bell Telephone Laboratories (1 from 2,714 patents)
5 patents:
1. 8019686 - Method and system for allowing simultaneous usage of prepaid services
2. 7627529 - Method and system for allowing simultaneous usage of prepaid services
3. 6389114 - Method and apparatus for relaying communication
4. 5835570 - Voice-directed telephone directory with voice access to directory
5. 4076968 - Telephone ringer intensity control responsive to ambient noise