Average Co-Inventor Count = 6.00
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. Hitachi, Ltd. (3 from 42,517 patents)
2. Hitachi Ome Electronic Co., Ltd. (2 from 7 patents)
3. Hitachi Tokyo Electronics Co., Ltd. (1 from 21 patents)
3 patents:
1. 4780606 - Projection aligner method utilizing monitoring of light quantity
2. 4701608 - Projection aligner with a sensor for monitoring light quantity
3. 4598197 - Projection aligner