Average Co-Inventor Count = 5.79
ph-index = 4
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. (4 from 42,485 patents)
4 patents:
1. 7317546 - Certification method and device and certificate issuer system
2. 5781731 - Schedule management support system
3. 5612720 - Systems for processing information and identifying individual
4. 5453762 - Systems for processing information and identifying individual