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
Method and a system for registering a 3D pre-acquired image coordinates system with a medical positioning system coordinate system and with a 2D image coordinate system
Method of forming wafer level mold using glass fiber and wafer structure formed by the same
Systems and methods for generating customized user interfaces
Information storage medium, reproducing method, and recording method
Push mechanism for efficiently sending aggregated data items to client
Pre-sealing unit for wire-cut electric discharge machine
Methods and system for providing drug pricing information from multiple pharmacy benefit managers (PBMs)
  Randomly Featured Patents
High throughput assays for transmissible spongiform encephalopathies (TSE)
Magnetic monocomponent developer and image forming method
Zinc based electrochemical cell
Egg yolk-containing, reduced-cholesterol, oil-in-water emulsified food and the preparation thereof
X-ray diagnostics installation for optional transillumination or exposure of an examination subject
Changing clock delays in an integrated circuit for skew optimization
Method of fabricating integrated circuit with improved yield rate
Heater-equipped air-fuel ratio sensor
Ink composition for ink jet recording and recording process using same
Thermal interface material with thin transfer film or metallization