Average Co-Inventor Count = 5.00
ph-index = 1
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. (1 from 42,488 patents)
2. Hitachi Information Systems, Ltd. (1 from 4 patents)
1 patent:
1. 5074684 - Dot printer device having a control unit to print horizontal lines