Average Co-Inventor Count = 1.00
ph-index = NA
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. Hitachi Metals, Ltd. (2,333 patents)
2. Tokyo Gas Company Limited (193 patents)
3. Sankoh Co., Ltd. (2 patents)
0 patent: