Average Co-Inventor Count = 3.83
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. Other (3 from 833,002 patents)
3 patents:
1. 5228526 - Overflow valve of drill string
2. 5221197 - Working member of a helical downhole motor for drilling wells
3. 4909337 - Rotor of a screw hydraulic downhole motor, method for its production and