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Class Information
Number: 175/296
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Fluid-operated
Description: Apparatus in which (1) the hammer or impact device is acted upon and propelled by a body of fluid to deliver a blow (2) a body of fluid acts directly upon the hammer or impact device, or on holding means therefor to restrain said device against movement, and means to relieve the device or holding means from the influence of the restraining fluid to deliver a blow or (3) a means for holding the hammer or impact device against movement is released by a body of fluid to deliver a blow.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6371220 |
Pneumatically reversible ram drilling tool |
Apr. 16, 2002 |
| 6371222 |
Hammer device |
Apr. 16, 2002 |
| 6371223 |
Drill head for directional boring |
Apr. 16, 2002 |
| 6367565 |
Means for detecting subterranean formations and monitoring the operation of a down-hole fluid driven percussive piston |
Apr. 9, 2002 |
| 6293357 |
Hydraulic in-the-hole percussion rock drill |
Sep. 25, 2001 |
| 6290005 |
Pneumatic impact damping device for a drill column |
Sep. 18, 2001 |
| 6290004 |
Hydraulic jar |
Sep. 18, 2001 |
| 6290424 |
Segmented ring mounting for a fluid-operated percussion drill tool |
Sep. 18, 2001 |
| 6237704 |
Backhead and check valve for down-hole drills |
May. 29, 2001 |
| 6209666 |
Percussive down-the-hole hammer and a piston and drill bit therefor |
Apr. 3, 2001 |
| 6182775 |
Downhole jar apparatus for use in oil and gas wells |
Feb. 6, 2001 |
| 6176324 |
Drilling device |
Jan. 23, 2001 |
| 6170581 |
Backhead and check valve for down-hole drills |
Jan. 9, 2001 |
| 6164393 |
Impact tool |
Dec. 26, 2000 |
| 6161631 |
Environmentally friendly horizontal boring system |
Dec. 19, 2000 |
| 6155361 |
Hydraulic in-the-hole percussion rock drill |
Dec. 5, 2000 |
| 6148934 |
Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
Nov. 21, 2000 |
| 6135216 |
Venting and sealing system for down-hole drills |
Oct. 24, 2000 |
| 6125952 |
Percussive down-the-hole hammer and a drill bit therefor |
Oct. 3, 2000 |
| RE36848 |
Air percussion drilling assembly |
Sep. 5, 2000 |
| 6109836 |
Soil consolidation apparatus, tool and method |
Aug. 29, 2000 |
| 6102139 |
Device for drilling a bore hole in the ground |
Aug. 15, 2000 |
| 6062324 |
Fluid operated vibratory oil well drilling tool |
May. 16, 2000 |
| 6050346 |
High torque, low speed mud motor for use in drilling oil and gas wells |
Apr. 18, 2000 |
| 6047778 |
Percussion drill assembly |
Apr. 11, 2000 |
| 6035954 |
Fluid operated vibratory oil well drilling tool with anti-chatter switch |
Mar. 14, 2000 |
| 5992545 |
Down-the-hole drilling machine |
Nov. 30, 1999 |
| 5957220 |
Percussion drill assembly |
Sep. 28, 1999 |
| 5937956 |
Ram boring machine |
Aug. 17, 1999 |
| 5934386 |
Small diameter impact boring tool impact head |
Aug. 10, 1999 |
| 5931242 |
Jarring tool enhancer |
Aug. 3, 1999 |
| 5931243 |
Hammer device |
Aug. 3, 1999 |
| 5918688 |
Gas-filled accelerator |
Jul. 6, 1999 |
| 5918687 |
Small diameter impact boring tool |
Jul. 6, 1999 |
| RE36166 |
Air percussion drilling assembly for directional drilling applications |
Mar. 30, 1999 |
| 5873579 |
Protective device for a fluid-operated percussion tool |
Feb. 23, 1999 |
| RE36002 |
Transmission sleeve for a down hole hammer |
Dec. 22, 1998 |
| 5839519 |
Methods and apparatus for attaching a casing to a drill bit in overburden drilling equipment |
Nov. 24, 1998 |
| 5816342 |
Small diameter impact boring tool |
Oct. 6, 1998 |
| 5803188 |
Hydraulically driven percussion hammer |
Sep. 8, 1998 |
| 5803192 |
Drill bit retainer for a down hole hammer assembly |
Sep. 8, 1998 |
| 5803187 |
Rotary-percussion drill apparatus and method |
Sep. 8, 1998 |
| 5803182 |
Bidirectional hydraulic jar |
Sep. 8, 1998 |
| 5794719 |
Ground boring apparatus |
Aug. 18, 1998 |
| 5794718 |
Maneuvering impact boring head |
Aug. 18, 1998 |
| 5791420 |
Jar enhancer |
Aug. 11, 1998 |
| 5787995 |
Water driven hammer device |
Aug. 4, 1998 |
| 5778993 |
Locking a sample tube in a downhole hammer |
Jul. 14, 1998 |
| 5749677 |
Apparatus for impact action |
May. 12, 1998 |
| 5735358 |
Indexing percussive drilling bit |
Apr. 7, 1998 |
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