Average Co-Inventor Count = 3.00
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. Grinnell Corporation (2 from 42 patents)
2 patents:
1. 5947152 - Check valve and backflow preventer
2. 5709240 - Check valve and backflow preventer