Average Co-Inventor Count = 5.49
ph-index = 7
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. (7 from 42,485 patents)
2. Hitachi Mito Engineering Co., Ltd. (7 patents)
7 patents:
1. 5283399 - Group control of elevator system improvement measures
2. 5239141 - Group management control method and apparatus for an elevator system
3. 5042620 - Elevator control system
4. 5010472 - Customer participatory elevator control system
5. 4995479 - Display guide apparatus of elevator and its display method
6. 4958707 - Elevator control system
7. 4947965 - Group-control method and apparatus for an elevator system with plural