Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Construction
Class Information
Number: 175/235
Name: Boring or penetrating the earth > With means movable relative to tool below ground to stop flow toward bore bottom > With longitudinally spaced valve seats > Seat engaged to stop upward flow
Description: Apparatus in which a surface or seat is engaged to stop the flow of material away from the bore bottom.










Patents under this class:

Patent Number Title Of Patent Date Issued
8408337 Downhole blowout preventor Apr. 2, 2013
8256538 Containment system for oil field riser pipes Sep. 4, 2012
6962215 Underbalanced well completion Nov. 8, 2005
6564885 Up-hole overshot and safety drilling apparatus May. 20, 2003
6408957 Sealed bearing roller cone bit having anti-plugging device Jun. 25, 2002
6145603 Extension drilling system Nov. 14, 2000
4664205 Hydraulic inner barrel in a drill string coring tool May. 12, 1987
4213508 Downhole fire control Jul. 22, 1980











 
 
  Recently Added Patents
Cup
Image forming apparatus
Cover opening and closing unit and image forming apparatus including the same
Flat display panel and method for forming the same
Imaging device and imaging method
Dry-cooling unit with gravity-assisted coolant flow
Mono-body defibrillation probe
  Randomly Featured Patents
Speech recognition based on interactive information retrieval scheme using dialogue control to reduce user stress
Oxidized olefin wax pour point depressants
Plastic package with exposed die
Wire coil assembly for an electrical circuit
Color-developing agent, silver halide photographic light-sensitive material and image-forming method
Siding holder
Digital envelope shaping apparatus
Process for obtaining transgenic leguminous plants (leguminosae) containing exogenous DNA
Information handling system bezel
Fingerprint verification method