Average Co-Inventor Count = 3.11
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. Nippon Iron Powder Co. Ltd. (2 from 6 patents)
2. Fuji Xerox Co., Ltd. (1 from 11,665 patents)
2 patents:
1. 4898801 - Magnetic carrier of developer for electrophotographic copying machines
2. 4598034 - Ferrite carriers for electrophotographic development