Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5228526 | Overflow valve of drill string | Andrei N. Vshivkov, Gennady A. Schelkonogov, Vladimir B. Goldobin, Mikhail G. Bobrov | 1993-07-20 |
| 5221197 | Working member of a helical downhole motor for drilling wells | Andrei N. Vshivkov, Vladimir B. Goldobin | 1993-06-22 |
| 4909337 | Rotor of a screw hydraulic downhole motor, method for its production and a device for its production | Andrei N. Vshivkov, Vladimir B. Goldobin, Samuil S. Nikomarov | 1990-03-20 |
| 4585401 | Multistage helical down-hole machine with frictional coupling of working elements, and method therefor | Dmitry F. Baldenko, Jury V. Vadetsky, Moisei T. Gusman, Samuil S. Nikomarov, Valery I. Semenets +3 more | 1986-04-29 |
| 4567953 | Bottom-hole multistart screw motor | Dmitry F. Baldenko, Talgat N. Bikchurin, Jury V. Vadetsky, Moisei T. Gusman, Samuil S. Nikomarov | 1986-02-04 |
| 4556398 | Hinge joint for a screw planetary hydraulic drill | Dmitry F. Baldenko, Yury V. Vadetsky, Vladimir B. Goldobin, Moisei T. Gusman, Samuil S. Nikomarov +1 more | 1985-12-03 |
| 4449953 | Articulated coupling | Samuil S. Nikomarov, Vladimir B. Goldobin, Jury M. Sarapulov, Isaak Y. Valdman | 1984-05-22 |