Average Co-Inventor Count = 4.20
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. Nec Corporation (1 from 35,658 patents)
2. Nippon Telegraph and Telephone Corporation (1 from 5,289 patents)
3. Nippon Telegraph and Telephone Public Corporation (1 from 522 patents)
2 patents:
1. 5025448 - Method and apparatus for stabilizing frequency of semiconductor laser
2. 4597085 - Double-channel planar heterostructure semiconductor laser