Average Co-Inventor Count = 1.50
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. Philadelphia Quartz Company (1 from 14 patents)
2. Philadephia Quartz Company (1 from 1 patent)
2 patents:
1. 4029514 - Method of precipitating microfine silica using phosphate
2. 4029513 - Surface treated silica