Average Co-Inventor Count = 7.74
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 Bell Laboratories (4 from 3,345 patents)
4 patents:
1. 5333180 - Call message delivery system and method utilizing caller-selected system
2. 5187710 - Method and apparatus for the billing of value-added communications calls
3. 4972461 - Call message delivery system and method
4. 4939771 - Attendant-controlled call message delivery system and method