Average Co-Inventor Count = 6.61
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)
3 patents:
1. 5291982 - Passenger conveyor, platform floor for passenger conveyor, and comb for
2. 5067593 - Braking device for elevator winding machine and elevator using the
3. 4982815 - Elevator apparatus