Average Co-Inventor Count = 5.00
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. Carl-zeiss-stiftung (2 from 702 patents)
2. Other (1 from 832,680 patents)
3 patents:
1. 6717722 - Catadioptric optical system and exposure apparatus having the same
2. 6496306 - Catadioptric optical system and exposure apparatus having the same
3. 6252712 - Optical system with polarization compensator