Average Co-Inventor Count = 4.00
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. Hitachi-high-technologies Corporation (4 from 2,874 patents)
4 patents:
1. 7566892 - Electron beam apparatus and method for production of its specimen chamber
2. 7435958 - Electron beam apparatus and method for production of its specimen chamber
3. 7205550 - Electron beam apparatus and method for production of its specimen chamber
4. 7030376 - Electron beam apparatus and method for production of its specimen chamber