Average Co-Inventor Count = 2.40
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. Ikegami Tsushinki Co., Ltd. (2 from 77 patents)
2. Video Research Ltd. (2 from 5 patents)
2 patents:
1. 5091877 - Data processing apparatus
2. 4905080 - Apparatus for collecting television channel data and market research data