Average Co-Inventor Count = 4.44
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. Dai Nippon Printing Co., Ltd. (2 from 3,196 patents)
2 patents:
1. 5932866 - Optical card with a built-in IC module technical field
2. 5698284 - Optical recording medium