Average Co-Inventor Count = 4.13
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 Electronic Service Co. Ltd. (3 from 3 patents)
3 patents:
1. 6983157 - Automatic report control system for reporting arrival at destination or passing point
2. 6769610 - Credit card double authentication system
3. 6726109 - Passport with anti-counterfeit ID chip