Average Co-Inventor Count = 7.63
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. Hitachi, Ltd. (3 from 42,508 patents)
3 patents:
1. 616215 - Ambulatory exercise machine and ambulatory exercise system
2. 6162151 - Ambulatory exercise machine and ambulatory exercise system
3. 5555179 - Control method and control apparatus of factory automation system