Average Co-Inventor Count = 8.47
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 28,577 patents)
2. Mitsui Petrochemical Industries, Ltd. (1 from 1,008 patents)
2 patents:
1. 5554478 - Electrophotographic dry toner
2. 5403690 - Developer for developing latent electrostatic images