Average Co-Inventor Count = 3.00
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. Asahi Kogaku Kogyo Kabushiki Kaisha (1 from 3,132 patents)
2. Pentax Corporation (1 from 1,056 patents)
2 patents:
1. 6690518 - Camera-attachment lens system
2. 6392820 - Optical system of a composite camera