Average Co-Inventor Count = 4.44
ph-index = 1
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. (1 from 42,496 patents)
2. Okamura Corporation (1 from 421 patents)
2 patents:
1. 11534907 - Management system and control method
2. 4672668 - Method and apparatus for registering standard pattern for speech