Average Co-Inventor Count = 3.84
ph-index = 6
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. (8 from 42,494 patents)
8 patents:
1. D519091 - Combined digital video disc recorder and video tape recorder
2. D513410 - Combined digital video disc recorder and hard disk recorder
3. D460428 - Digital video disc player
4. D459709 - Digital video disc player
5. D459321 - Digital video disc player
6. D410919 - Digital video disc player
7. 5717818 - Audio signal storing apparatus having a function for converting speech
8. D300431 - Cordless handset telephone