Average Co-Inventor Count = 5.00
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. Sumitomo Special Metals Co., Ltd. (4 from 240 patents)
4 patents:
1. 5230749 - Permanent magnets
2. 4975129 - Permanent magnet
3. 4859255 - Permanent magnets
4. 4773950 - Permanent magnet