Average Co-Inventor Count = 3.46
ph-index = 3
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, Ltd. (3 from 42,508 patents)
3 patents:
1. 5231307 - Starter for starting internal combustion engine
2. 4978596 - Electrophotographic toner comprising lactone-modified epoxy resin
3. 4586015 - Transformer with a surface shield layer