Average Co-Inventor Count = 4.44
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 42,508 patents)
2. American Express International Inc. (1 from 1 patent)
2 patents:
1. 5455406 - Automatic transaction apparatus
2. 5382777 - Automated teller machine