Resources Contact Us Home
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
Assisted hybrid mobile browser
Base station, relay station, and bandwidth allocation method
Sensor system
Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, image forming method, and image forming apparatus
Radio frequency power delivery system
Latch-up free ESD protection
Substrate processing apparatus and display method of substrate processing apparatus
  Randomly Featured Patents
Updating profile frequency for procedure inlining
Electrical connectors including power failure warning means
Microball placement solutions
Mobile phone
Circuit for determining the parameter control states of an implanted pacer
Multi-color electro-luminescent light strip and method of making same
Arbor for annular hole cutter
Chip varistor and chip varistor manufacturing method
Wafer pads for fixed-spindle floating-platen lapping
Memory transfer with early access to critical portion