Average Co-Inventor Count = 2.27
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. American Tel-a-Systems, Inc. (2 from 18 patents)
2. American Tel-a-System, Inc. (2 from 4 patents)
3. America Tel-a-System, Inc. (1 from 1 patent)
5 patents:
1. 5469491 - Telephone answering service with integrated voice and textual message
2. 5420852 - Digital switching system connecting buses with incompatible protocols
3. 5259024 - Telephone answering service with integrated voice and textual message
4. 5113429 - Telephone answering service with integrated voice and textual message
5. 4916726 - Telephone answering service with integrated voice and textual message