Average Co-Inventor Count = 6.00
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. Rikagaku Kenkyusho (2 from 126 patents)
2. Sigma Systems Co., Ltd. (1 from 1 patent)
2 patents:
1. 5929778 - Data carrier system
2. 5819008 - Mobile robot sensor system