Vsesojuzny Nauchnoissledovatelsky Institut Burovoi Tekhniki

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4823889 Downhole screw motorExpiredAug 21, 87Apr 25, 89[E21B]
4764094 Screw machine having a plurality of symmetrically arranged rotorsExpiredMar 20, 87Aug 16, 88[F03C, F01C]
4711006 Downhole sectional screw motor, mounting fixture thereof and method of oriented assembly of working members of the screw motor using the mounting fixtureExpiredMar 17, 86Dec 08, 87[B23Q, B23P]
4676716 Hydraulic multistage turbine of turbodrillExpiredNov 04, 85Jun 30, 87[F03B, F04D]
4606700 Turbodrill multistage turbineExpiredOct 15, 79Aug 19, 86[F01D]
4567953 Bottom-hole multistart screw motorExpiredDec 10, 80Feb 04, 86[E21B]
4556398 Hinge joint for a screw planetary hydraulic drillExpiredJul 18, 84Dec 03, 85[E21B]
4518049 Bottom hole motor for driving rock-breaking toolExpiredJun 18, 84May 21, 85[E21B]
4475605 TurbodrillExpiredSep 10, 81Oct 09, 84[E21B]
4470464 Valve meansExpiredFeb 11, 82Sep 11, 84[E21B]

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