Average Co-Inventor Count = 8.55
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. Chugai Seiyaku Kabushiki Kaisha (2 from 950 patents)
2 patents:
1. 6559149 - Methotrexate derivatives
2. 5354753 - Methotrexate derivative