Average Co-Inventor Count = 4.29
ph-index = 4
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 Chemical Company, Ltd. (4 from 1,641 patents)
4 patents:
1. 6372817 - Friction material composition, production of the same and friction material
2. 6220404 - Non-asbestos disc brake pad for automobiles
3. 5093057 - Clutch driven plates and method of producing the same
4. 5004089 - Clutch driven plates and method of producing the same