Average Co-Inventor Count = 3.43
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. (2 from 42,517 patents)
2. Hitachi-Mito Kogyo, Ltd. (1 from 1 patent)
3. Hitachi Elevator Engineering Ltd. (1 from 1 patent)
2 patents:
1. 4674619 - Passenger conveyor
2. 4235326 - Main frame construction of conveyor