Average Co-Inventor Count = 4.09
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. Qwest Communications International Inc. (2 from 435 patents)
2. Qwest Communications Int'l., Inc. (1 from 16 patents)
3 patents:
1. 7133508 - Prepaid long distance call system and method
2. 6748058 - Caller identification system with announcement capability
3. 6549619 - Method for screening calls