Average Co-Inventor Count = 2.82
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. Amtel Communications, Inc. (4 from 9 patents)
4 patents:
1. 4727357 - Compact keyboard system
2. 4701950 - Telephone answering system with line detector
3. 4634811 - Call screening system
4. 4629831 - Series connected interceptor