Average Co-Inventor Count = 2.43
ph-index = 3
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, Ltd. (3 from 42,508 patents)
2. Hitachi Keiyo Engineering Co., Ltd. (1 from 34 patents)
3. Hitachi Keiyo Engineering & Systems, Ltd. (1 from 1 patent)
3 patents:
1. 8858397 - Training device and a control method of the same
2. 8337364 - Training support system and training support method
3. 5307501 - Insuring data security and requiring only the minimum necessary input