Average Co-Inventor Count = 1.20
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. Other (3 from 832,966 patents)
2. Rion Company Ltd. (2 from 85 patents)
4 patents:
1. 8057234 - Foreign language learning apparatus
2. 7729907 - Apparatus and method for preventing senility
3. 7502483 - Hearing aid, training device, game device, and audio output device
4. 7421392 - Diagnosis device and diagnosis method