Average Co-Inventor Count = 2.67
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. Sankyo Seiki Mfg. Co., Ltd (2 from 264 patents)
2 patents:
1. 6494365 - Card issuing device and method
2. 6398435 - Marking press device for producing raised symbols with or without coloring