Average Co-Inventor Count = 3.00
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. Kawasaki Steel Corporation (2 from 1,256 patents)
2. Furukawa Aluminum Co., Ltd. (2 from 35 patents)
3. C. Itoh & Co., Ltd. (2 from 13 patents)
2 patents:
1. 4829799 - Method of manufacturing substrate for memory disk
2. 4823578 - Method of manufacturing substrate for memory disk