Average Co-Inventor Count = 1.75
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. Yamamoto Kogaku Co., Ltd. (2 from 120 patents)
2. Sharp Corporation (1 from 847 patents)
2 patents:
1. 7625082 - Eyeglasses
2. 7170058 - Device for assisting a person in rescue operations under hazardous situations