Average Co-Inventor Count = 6.15
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. (1 from 42,517 patents)
2. Ricoh Company, Ltd. (1 from 28,584 patents)
2 patents:
1. 9888874 - Stimulus presentation system
2. 7194471 - Document classification system and method for classifying a document according to contents of the document