Average Co-Inventor Count = 6.00
ph-index = 1
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. Nippon Telegraph and Telephone Public Corporation (1 from 522 patents)
2. Iwasaki Tsushinki Kabushiki Kaisha (1 from 33 patents)
1 patent:
1. 4144413 - Rotary telephone dial