Average Co-Inventor Count = 3.33
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. D290001 - Video tape recorder
2. D286405 - Video camera
3. D284082 - Video camera
4. D281684 - Combined video tape recorder and video camera