Average Co-Inventor Count = 1.00
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. Anderson, Greenwood & Co. (2 from 16 patents)
2 patents:
1. 4222408 - Check valve
2. 3986525 - Internal tank valve