Andrei N. Vshivkov

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Patents Grantslast 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