Average Co-Inventor Count = 3.48
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 (2 from 2,874 patents)
2. Hitachi High-Tech Corporation (1 from 1,146 patents)
3 patents:
1. 11668892 - Alignment device and optical device
2. 10770260 - Defect observation device
3. 10642164 - Defect detection device and defect observation device