Average Co-Inventor Count = 2.00
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. Pilgrim Telephone, Inc. (2 from 8 patents)
2 patents:
1. 5802160 - Multi-ring telephone method and system
2. 5146491 - Telephone billing method