Average Co-Inventor Count = 4.83
ph-index = 5
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. (6 from 42,526 patents)
2. Hitachi Construction Machinery Co., Ltd. (1 from 1,508 patents)
7 patents:
1. D479230 - Computer
2. D452703 - Printer
3. D437602 - Hydraulic excavator
4. D437348 - Printer
5. D434068 - Printer for electronic computer
6. D432534 - Computer
7. D422977 - Electronic exchange