Average Co-Inventor Count = 3.70
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 42,517 patents)
2. Hitachi Techno Engineering Co., Ltd. (1 from 41 patents)
3 patents:
1. 6156090 - Air cleaner having vanes with a winglike cross-section between a shroud
2. 5250788 - Apparatus for handling sheets of paper using robot hands
3. 5019249 - Apparatus for handling sheets of paper