Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Construction
Class Information
Number: 175/294
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Combined with safety joint
Description: Apparatus combined with a joint between two parts which may be selectively uncoupled below ground independently of other joints in the apparatus, such that one part may be left in the bore while the other part is withdrawn therefrom.










Patents under this class:

Patent Number Title Of Patent Date Issued
8590642 Percussion hammer bit retention system Nov. 26, 2013
7267185 Bit retainer system Sep. 11, 2007
5086843 Oil tool release joint Feb. 11, 1992
4064953 Shear sub for drill string Dec. 27, 1977











 
 
  Recently Added Patents
Pandemic protocol for emergency dispatch
Three-dimensional filter
Method and apparatus for establishing a media clip
Method and apparatus for determining the altitude of a mobile device
Alkaline battery
Phosphor adhesive sheet, light emitting diode element including phosphor layer, light emitting diode device, and producing methods thereof
Scanning projection apparatus with tangential compensation
  Randomly Featured Patents
Timer
Semiconductor device and its manufacture method
Method of reducing doming in a color display tube and a color display tube made in accordance with the method
Image processing apparatus for color correcting an image which can monitor the result of the color correction
Gas turbine engine fan blade retention
Silicon carbide precursors
Cancer immunotherapy predictive parameters
Method and apparatus for VF tube power supply
Perpetual calendar
Lithographic apparatus and device manufacturing method