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Anatoly M. Kochnev
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last 30 patents
Information
Patent Grant
Overflow valve of drill string
Patent number
5,228,526
Issue date
Jul 20, 1993
Andrei N. Vshivkov
E21 - EARTH DRILLING MINING
Information
Patent Grant
Working member of a helical downhole motor for drilling wells
Patent number
5,221,197
Issue date
Jun 22, 1993
Anatoly M. Kochnev
F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information
Patent Grant
Rotor of a screw hydraulic downhole motor, method for its productio...
Patent number
4,909,337
Issue date
Mar 20, 1990
Anatoly M. Kochnev
E21 - EARTH DRILLING MINING
Information
Patent Grant
Multistage helical down-hole machine with frictional coupling of wo...
Patent number
4,585,401
Issue date
Apr 29, 1986
Veesojuzny Ordena Trudovogo Krasnogo Znameni Naucho-Issle
Dmitry F. Baldenko
E21 - EARTH DRILLING MINING
Information
Patent Grant
Bottom-hole multistart screw motor
Patent number
4,567,953
Issue date
Feb 4, 1986
Dmitry F. Baldenko
E21 - EARTH DRILLING MINING
Information
Patent Grant
Hinge joint for a screw planetary hydraulic drill
Patent number
4,556,398
Issue date
Dec 3, 1985
Vsesojuzny Nauchnoissledovatelsky Institut Burovoi Tekhniki
Dmitry F. Baldenko
E21 - EARTH DRILLING MINING
Information
Patent Grant
Articulated coupling
Patent number
4,449,953
Issue date
May 22, 1984
Permsky Filial Vsesojuznogo Nauchno-Issledovatelskogo Instituta Burovoi Tekhniki
Samuil S. Nikomarov
E21 - EARTH DRILLING MINING