Average Co-Inventor Count = 1.26
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 (2 from 3,345 patents)
2. American Telephone & Telegraph Co., At&t Bell Laboratories (1 from 745 patents)
3. American Telephone and Telegraph, Co. (1 from 386 patents)
4 patents:
1. 5309512 - Call waiting deluxe feature
2. 5007076 - Call announcement arrangement
3. 4922490 - Telephone station set
4. 4899358 - Call announcement arrangement