Average Co-Inventor Count = 5.83
ph-index = 1
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-high-technologies Corporation (4 from 2,874 patents)
4 patents:
1. 8071961 - Charged particle beam apparatus
2. 7601974 - Charged particle beam apparatus
3. 7247864 - Charged particle beam apparatus
4. 7205541 - Charged particle beam apparatus