Average Co-Inventor Count = 4.09
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. Osaka Gas Company Limited (3 from 352 patents)
2. Dainippon Ink and Chemicals, Incorporated (1 from 630 patents)
3 patents:
1. 4986895 - Process for treating coal tar or coal tar pitch
2. 4859382 - Process for preparing carbon fibers elliptical in section
3. 4640761 - Process for preparing pitch