Average Co-Inventor Count = 4.08
ph-index = 5
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. (5 from 4,208 patents)
5 patents:
1. 6463139 - Combination pre-paid and calling card
2. 6385308 - Telephone system and method for personalized announcements
3. 6137872 - Combination pre-paid and calling card
4. 5946380 - Communications system and method with call expenditure control
5. 5392343 - On demand language interpretation in a telecommunications system