Average Co-Inventor Count = 3.80
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. (5 from 42,485 patents)
5 patents:
1. D304595 - Combined video tape recorder and camera
2. D297931 - Video tape recorder
3. D294347 - Video tape recorder
4. D284082 - Video camera
5. D281684 - Combined video tape recorder and video camera