Average Co-Inventor Count = 2.40
ph-index = 3
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. (3 from 42,488 patents)
3 patents:
1. D296696 - Central processor unit
2. D293242 - Controller for a point-of-sales system
3. D293245 - Printer for a point-of-sales system