Average Co-Inventor Count = 6.61
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. (6 from 42,485 patents)
6 patents:
1. 6477239 - Sign language telephone device
2. 6181778 - Chronological telephone system
3. 5990878 - Sign language editing apparatus
4. 5953693 - Sign language generation apparatus and sign language translation
5. 5734923 - Apparatus for interactively editing and outputting sign language
6. 5659764 - Sign language generation apparatus and sign language translation