Average Co-Inventor Count = 6.00
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. Japanese National Railways (2 from 50 patents)
2. Denki Kagaku Kogyo Kabushiki Kaisha (1 from 475 patents)
3. Onoda Cement Co., Ltd. (1 from 101 patents)
4. Nichireki Chemical Industry Company Limited (1 from 2 patents)
5. Toa Doro Kogyo Co., Ltd. (1 from 1 patent)
2 patents:
1. 4084981 - Quick hardening cement-asphalt composition
2. 4060425 - Super rapid hardening mixture