Average Co-Inventor Count = 2.86
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. Sumitomo Cement Co., Ltd. (2 from 35 patents)
2. Kabushiki Kaisha Toshiba (1 from 52,735 patents)
2 patents:
1. 5214345 - Ultraviolet ray-shielding agent and tube
2. 5051650 - Ultraviolet-suppressed light source, coating agent used in the same, and