Average Co-Inventor Count = 4.09
ph-index = 3
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. Union Oil Company of California (3 from 1,113 patents)
3 patents:
1. 5649568 - Glass fiber reinforced cement liners for pipelines and casings
2. 5566986 - Dual gasket lined pipe connector
3. 5405171 - Dual gasket lined pipe connector