Average Co-Inventor Count = 6.50
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 42,517 patents)
7 patents:
1. 5892190 - Method and system of controlling elevators and method and apparatus of
2. 5307903 - Method and system of controlling elevators and method and apparatus of
3. 5239141 - Group management control method and apparatus for an elevator system
4. 5010472 - Customer participatory elevator control system
5. 4989694 - Elevator group supervisory system
6. 4947965 - Group-control method and apparatus for an elevator system with plural
7. 4852696 - Information device of elevator