Average Co-Inventor Count = 1.83
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. Ricoh Company, Ltd. (2 from 28,546 patents)
2 patents:
1. 4919045 - Offset printer having a press drum larger than its rubber drum
2. 4831553 - Plate making and printing press