Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Construction
Class Information
Number: 175/390
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore > Impact type > Plural larger diameter steps
Description: Apparatus in which the cutting edges of the impact bit are arranged so that the boring outline of the bit will describe at least two peripheral axial steps.










Patents under this class:

Patent Number Title Of Patent Date Issued
8550190 Inner bit disposed within an outer bit Oct. 8, 2013
7938205 Boring head method and boring head for a ground boring device May. 10, 2011
5205366 Superposed drilling device Apr. 27, 1993
4858703 Self-propelled subsoil penetrating tool system Aug. 22, 1989
4749050 Impact tool for tunneling Jun. 7, 1988
4317595 Chisel for a crust breaking facility Mar. 2, 1982
4144941 Directional impact tool for tunneling Mar. 20, 1979
4100979 Pneumatic percussion boring device Jul. 18, 1978
RE29300 Rotary percussion earth boring bit Jul. 12, 1977
4016944 Pneumatic hammer-auger earth boring apparatus Apr. 12, 1977
3960223 Drill for rock Jun. 1, 1976











 
 
  Recently Added Patents
Front end for RF transmitting-receiving systems with implicit directional control and time-multiplexing method in submicron technology
Methods of saccharification of polysaccharides in plants
Processes for producing polyunsaturated fatty acids in transgenic organisms
Three-dimensional holographic display using active shutter
Systems, methods, and media for firewall control via remote system information
Vehicle detection apparatus and method using magnetic sensor
Monitoring heap in real-time by a mobile agent to assess performance of virtual machine
  Randomly Featured Patents
Methods of making stabilized crystalline alumina compositions, and alumina compositions and catalyst supports made therefrom
Method of manufacturing fabric with rubber for tire
Three-phase exciter for synchronous machines
Apparatus for refining oils or fats
Electric lock actuator
Handle for a portable table
Apparatus for galvanic detection of optical absorptions
Method of evaluating optical element
"If" and "switch" as drag and drop objects
Method and device for increasing effective radiated power from a subscriber device