Average Co-Inventor Count = 2.18
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. (5 from 42,517 patents)
2. Clarion Co (1 from 1,057 patents)
6 patents:
1. 12086731 - Workshop assistance system and workshop assistance method
2. 11037553 - Learning-type interactive device
3. 8706171 - Hands-free terminals and hands-free system for cars
4. 7991616 - Speech synthesizer
5. 7113909 - Voice synthesizing method and voice synthesizer performing the same
6. 6819301 - Information providing system and information providing apparatus for mobile object