Average Co-Inventor Count = 3.00
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. Tamura Electric Works, Ltd. (2 from 60 patents)
2 patents:
1. 5714743 - Card and card issuing apparatus
2. 5661289 - Card and card check method