Average Co-Inventor Count = 3.00
ph-index = 3
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. Kabushiki Kaisha Topcon (2 from 1,033 patents)
2. Other (1 from 832,843 patents)
3 patents:
1. 7292713 - Eye test service system
2. 7274806 - Service system for selecting personal goods to wear or carry, and program product therefor
3. 7010146 - Database constructing system