Average Co-Inventor Count = 6.43
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. Hitachi, Ltd. (2 from 42,496 patents)
2. Nichirei Corporation (1 from 11 patents)
2 patents:
1. 5496175 - Questionnaire system
2. 5313392 - Method for supporting merchandise management operation and system