Average Co-Inventor Count = 1.85
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. (4 from 42,485 patents)
4 patents:
1. 8139927 - Information recording apparatus and information recording method
2. 7417680 - Digital video reproduction apparatus and method
3. 7391964 - Information recording apparatus and information recording method
4. 4958242 - Cue signal recording control system for video tape recorder