Average Co-Inventor Count = 4.44
ph-index = 4
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 832,912 patents)
2. Vsesojuzny Nauchnoissledovatelsky Institut Burovoi Tekhniki (1 from 7 patents)
3. Permsky Filial Vsesojuznogo Nauchno-Issledovatelskogo Instituta Burovoi (1 from 1 patent)
5 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
4. 4556398 - Hinge joint for a screw planetary hydraulic drill
5. 4449953 - Articulated coupling