Average Co-Inventor Count = 4.57
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. D314376 - Computer display
2. D309130 - Central processor for an electronic computer
3. D290844 - Disc drive
4. D278712 - Central processor unit